My boss insisted that I _______ the work before ten o’clock tonight.
| A．can finish | B．must finish | C．must have finished | D．finish |
You’d better come back earlier _______ it is getting colder.
| A．as | B．and | C．but | D．or |
He was walking along the sands _______ he saw a big foot-print in the sand .
A. whileB. whenD. asD. after
_______ he was sleeping , they stole his clothes.
| A．While | B．When | C．As | D．Which |
Jack was very tired _______ he played tennis all afternoon .
| A．if | B．as soon as | C．because | D．before |
______ he finished his work , he left hurriedly.
| A．As soon as | B．As if | C．Unless | D．In order that |