Five minutes earlier, and we the last bus now.
| A．had caught |
| B．should have caught |
| C．could catch |
| D．caught |
Persist to the end , _______ you are the only one left.
| A．even if /though | B．but | C．however | D．in spite of |
He always talks _______ he had been to outer space.
| A．like | B．as if /though | C．because of | D．as |
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 |