He ____ busy then; otherwise, I believe, he would have given you a hand．
| A．had been | B．were | C．must be | D．was |
-- Can I call you back at two o'clock this afternoon?
-- I'm sorry, but by then I ____ to Beijing. How about five?
| A．fly | B．will fly |
| C．will be flying | D．am flying |
The little boy was allowed to go to have a swim _____ he finished his homework.
| A．in case | B．provided that |
| C．now that | D．by the time |
-- Can you keep an eye on my bag? I need to go to the washing closet.
-- ________ . It'll be safe with me.
| A．It's my pleasure | B．Never mind |
| C．Go ahead | D．Forget it |
——If you make it in the competition, I’ll buy you a drink.
——Ok. ______!
| A．That’s a deal | B．That’s all right |
| C．Good luck | D．Take care |
Many college students are willing to work in Western China after graduation _______, poor and backward as it is, more opportunities of employment are available.
| A．which | B．when | C．that | D．where |