—Peter looked tired and a little absent-minded in class．
—He _____ too late．
| A．may stay up | B．could stay up |
| C．should have stayed up | D．must have stayed up |
She said the fun of reading books was different from ___ of any other kind．
| A．one | B．that | C．it | D．those |
---Would you mind me opening that door?
---_____ , but it’s not allowed．
| A．Yes, I do ． | B．Of course． | C．Not at all． | D．I’m sorry． |
The roads are crowded _____ walking is quicker than driving．
| A．in order that | B．so that | C．so as to | D．in order to |
---Did your car break down again this morning?
---Yes．That’s ____ I was late．
| A．why | B．because | C．how | D．for |
You must do your homework now; you ___ basketball all the evening．
| A．have been playing | B．play |
| C．are playing | D．played |