Not until he left his home ______ to know how important the family was for him.
| A．did he begin | B．had he begun | C．he began | D．he had begun |
Do you know the farmer under the big tree?
| A．lied | B．laid | C．laying | D．lying |
The ____ boy was last seen ______ by the lake.
A missing, playing B．missing, play C． missed, played D．missed , to play
—There is likely to be heavy rain tomorrow.
—_______, we’ll have to change the plan for the outgoing.
| A．If so | B．If not | C．Unless so | D．Unless not |
People have realized that they should go on _____ balanced diet and do _____ exercise every day.
| A．a; / | B．the; an | C．the; the | D．/; an |
________ your next high-adventure trip is scheduled, start preparing now.
| A．In case | B．Unless | C．Only if | D．Whenever |