Give a suitable preposition: In the UK, poor air quality is responsible some 40,000 deaths each year. (Miễn phí)

He got down to writing the letter as soon as he returned from his walk.

A. No sooner had he returned from his walk when he got down to writing the letter.

B. Not until he returned from his walk did he get down to writing the letter.

C. Only after he had returned from his walk did he get down to writing the letter.

D. Hardly had he returned from his walk when he got down to writing the letter.

I prefer going out for a meal to staying at home. ⇒ I'd rather........

The outcome of the election was never in doubt. => At no time …

The only reason the party was a success was that a famous film star attended.

A. Had it not been for the attendance of a famous film star, the party would not have been a success.

B. Hadn't it been for the attendance of a famous film star, the party would not have been a success.

C. Had the party not been a success, a famous film star wouldn't have attended.

D. Hadn't the party been a success, a famous film star wouldn't have attended.

If you still want to maintain this relationship, you ____ behave improperly like that.

A. ought to not

B. ought not to

C. mustn't

D. don't have to

The only thing that kept us out of prison was the way he spoke the local dialect.

⇒ But for his command …

He forgot about the gun until he got home.

A. Not until he got home did he forget about the gun.

B. Not until he got home did he remember about the gun.

C. Not until he had got home did he remember about the gun.

D. Not until he had got home did he forget about the gun.