When I try to find _______ that prevents so many people from taking part in the program,it seems to me that there are two main causes.
| A．why it does | B．what it does |
| C．what it is | D．why it is |
Remember to send me a photo of us next time you ______ to me.
| A．are writing | B．will write |
| C．has written | D．write |
--- I ______ so busily recently that I ______ no time to help you with your math.
--- That’s OK. I can manage it by myself.
| A．have been working; have |
| B．have worked; had |
| C．am working; will have |
| D．had been working; had had |
--- Oh, dear. I forgot the air tickets.
--- You ______ something.
| A．have left | B．are always leaving |
| C．are leaving | D．always left |
—Many of my classmates have a bad opinion of Li Xiaojun.
—____.
| A．What a shame! | B．But he is spoken better of by the teachers. |
| C．Poor Xiaojun! | D．It’s really disappointing. |
It was playing computer games that cost the boy plenty of time he ____ doing his lessons.
| A．might have spent | B．ought to have spent | C．must have spent | D．could have spent |