you / volunteer / if / you / help / other / people / willingly / and / without / payment.

A. Although we tried very hard, we failed in the final match.

B. We made all our efforts so that we could gain success in the final match.

C. Whatever efforts we had made, we weren’t able to win in the final match.

D. We failed in the final match as a result of all our great efforts.

A. I used to live in a flat when I was a child.

B. I am accustomed to living in a flat when I was a child.

C. When I was a little boy, I accustomed to living in a flat.

D. I used to live in a flat during my childhood.

A. This room should be cleaned every day.

B. This room should been cleaned every day.

C. This room should clean every day.

D. This room should be clean every day.

A. We were warned not going out alone

B. We were warned not to go out alone by people.

C. We weren't warned to go out alone.

D. We were warned not to go out alone.

A. Don’t go camping in the mountain.

B. People never go camping in the mountain.

C. Why going camping in the mountain?

D. What about going camping in the mountain?

A. If there is a fire in your house, to call 114.

B. If there is a fire in your house, calling 114.

C. If there be a fire in your house, call 114.

D. If there is a fire in your house, call 114.

A. You shouldn’t turn off the lights before going out.

B. Turning off the lights before you go out isn’t permitted.

C. You should turn off the lights before going out.

D. You have turn off the lights when you go out.