here yesterday, he could have seen Jackie Chen.
| A．If Bob has come | B．If Bob came |
| C．Had Bob come | D．If Bob should come |
Though the road covered with snow was very smooth, the old man smilingly ____ to be helped by others across the road．
| A．refused | B．declined | C．accepted | D．promised |
. Garter Druse _____ his being selected for the important task to his courage，devotion and knowledge of the area.
| A．led | B．owed | C．devoted | D．thanked |
______ it have been the failure to pick up directions from the ground control that caused the air crash?
| A．Must | B．Could | C．Would | D．Should |
____ no cash for food, he broke into an old woman's house, hoping to steal some money.
| A．Because | B．As | C．Since | D．With |
--- I’m not good at dancing, you know.
--- . It’s just for fun.
| A．All right | B．No problem | C．Come on | D．Cheer up |