chọn đáp án đúng (thì bị động ) 1.the flight attendant reminded the man that smoking .......there (allow) 2.america ..... by colombus in 1492(discovere) 3.parrots and crows ..... the most intelligent birds (consider ) 4. i still can't believe ! my bicycle ..... last night (steal ) 5.many traffic accidents....by dangerous driving (cause) 6.grass ...... by fat cows on the green meadow (eat) 7.so much progress........that there may be space -flights to mars (made) 8.english ....since 2002 (learn) 9.your bill should ....before you leave the hotel (paid)

2 câu trả lời

1. was allowed

2. was discovered

3. are considered

4. was stolen

5. are caused

6. is eaten

7. is made

8. has been learned

9. be paid

was alowed

was discovered

are consided

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