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a/ tập hợp D các số tự nhiên nhỏ hơn 7 rồi điền kí hiệu ∈, ∉ vào ô trống 2...D , 7...D
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Exercise 2: Complete the sentences with the correct form of words 1.If you___________(find) a wallet in the street, what would you do with it? 2.I must hurry. My friend____________(be) annoyed if I___________(not/be) on time.If I________(be) a bird, 3.I_____________(not/want) to live my whole life in a cage. 4.I didn’t realize that Gary was in the hospital. If I____________(know) he was in hospital, I___________(go) to visit. 5.If you_____________(pour) oil on water, it_____________(float) 6.If the phone____________(ring), can you answer it? 7.If I______________(have) wings, I______________(not/have to) take an airplane to fly home. A: What will we do tomorrow? B: Well, if it___________(be) a nice day, we____________(go) to the beach. A: You look tired. B: If you_____________(not/wake) me up in the middle of the night, I__________(not/be) tired. 8.This soup isn’t very good. it____________(taste)better if it___________(not/be) so salty. 9.Unfortunately, I didn’t have my address book with me when I was in New York. If I___________(have) your address, I____________(send) you a postcard. 10.I think there are many cars. If there_____________(not/be) so many cars, there___________(not/be) so much pollution. 11.The accident was your fault. If you___________(drive) more carefully, it_____________ (not/happen). 12.People___________(be) able to fly if they____________(have) feathers instead of hair. 13.Last night Alex ruined his sweater when he washed it. If he___________(read) the label, he______________(not/wash) it in hot water.

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