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1、Unit 4 History and traditionsPeriod 3 Discovering Useful Structure过去分词做宾语和宾补1.单句语法填空1We see an old man sweeping the _(fall) leaves every morning when we pass the post office2Our teacher was very worried because there was only a little time_(leave) for us to finish this task3Generally speaking, the c
2、hildren _ (bring) up by grandparents tend to feel lonely sometimes4It is amazing that he fell in love with the girl _ (dress) in a red skirt at the first sight5As is known to us all, Tsinghua University, _ (found) in 1911, is one of the top universities in the world6There was an _ (excite) look on h
3、is face when the actress appeared7The players _ (select) from the whole country are expected to bring us honor in this summer game8They spent two hours discussing the plan _ (design) by the famous engineer9The _ expression on his face suggested that he was not able to work out the confusing problem(
4、confuse)10The teacher wanted our compositions _ (hand) in after class11Id appreciate it if you could suggest a good way to get my English _ (improve) in a short period of time12With all her business things _ (arrange), Diana went on holiday13The speaker raised his voice but still couldnt make himsel
5、f _ (hear)14Back from his twoyear medical service in Africa, DrLee was very happy to see his mother _ (take) good care of at home.翻译短语（运用上过去分词短语）1 Theyre having a meeting to discuss the serious problem_.（人人都知道的）2To solve the problem, we should meet the demand _(顾客提出的)3To his surprise, he didnt_ on t
6、he bus（注意到钱包被人偷了）4 Youd better leave_ before all the guests are seated（不要动所有的菜）5 The young lady was quite annoyed to_（发现她珍贵的项链丢了）6The couple felt very satisfied to see their daughter _ in the new nursery（被照料）III单句语法填空1 To tell the truth, you must make every effort to improve your _(speak) English2To
7、 his surprise, Jack found his son _ (dress) as Santa Claus on Christmas Eve3I once found my cell phone _ (miss) during my stay in the city4If you want to make yourself _ (respect), you are above all to respect yourself5The student likes reading stories _ (write) by the famous writer6Many _ (use) com
8、puters will be sold in this market7Prices of daily goods _ (buy) through a computer can be lower than store prices8We should pay attention to the physical and mental health problems _ (cause) by a lack of sleep9John received an invitation to dinner, and with his work _ (complete), he gladly accepted
9、 it10Dont leave the water _ (run) while you are brushing your teethIV 七选五Rainbows(彩虹) are one of the most beautiful works that nature creates1_If youve ever seen one, consider yourself luckyRainbows can be seen when light passes through raindrops, says Kristin Calhoun, a research scientist studying
10、the conditions of weatherWhen sunlight passes through raindrops, the light bends, as it enters a dropletAs it leaves the droplet, the light separates into different wavelengths(波长)2_ The seven colorsred, orange, yellow, green, blue, indigo and violetbend in seven different directionsRed light, for e
11、xample, bends in a different way than violet light3_It also explains why rainbows look like an arc(弧)Sometimes, however, rainbows can actually form a circle that you can see in a plane with the right conditions4_“There is an even better chance when the sun is at a lower level, early or later in the
12、day，” Calhoun saysAnd another key is to face the rain and have your back to the sun5_“Small showers and storms often form in late afternoon in this area，”Calhoun says“These types of showers often produce heavy rain, but remain isolated(孤立的) over the center of the island”AThere are lots of stories re
13、lating to rainbowsBRainbows are created by light through raindropsCAnd each wavelength appears as a different colorDWith the conditions just right, Hawaii gets lots of rainbowsEThe best time to catch a rainbow is when its sunny and rainingFBut they can be seen only if you are in the right place at the right timeGThis is why the person on the ground sees each color at a different location