27. I’m sure the letter won’t arrive on time unless it ______ by air. A. sent B. sends C. will be sent D. is sent 28. I have known a person ______ hometown is famous for grapefruits. A. who B. that C. whose D. whom 29. It was cloudy. ______, the photos came out very bad. A. As a result B. However C. Nevertheless D. Otherwise 30. Did John book ______ one-way ticket to London yesterday? – Yes, he did. A. a B. an C. the D. Ø

27. I’m sure the letter won’t arrive on time unless it ______ by air.
A. sent B. sends C. will be sent D. is sent

câu bị động "it" thì hiện tại đơn uless + hiện tại 

28. I have known a person ______ hometown is famous for grapefruits. 
A. who B. that C. whose D. whom

Dịch : Tôi có biết một người mà quê hương nổi tiếng về quả bưởi

29. It was cloudy. ______, the photos came out very bad. 
A. As a result B. However C. Nevertheless D. Otherwise

However thường đứng giữa . and ,

30. Did John book ______ one-way ticket to London yesterday? – Yes, he did. 
 A. a B. an C. the D. Ø

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