________ is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.
| A．Which | B．What |
| C．As | D．That |
— How do you know so much about what’s going on in the countryside?
— I’ve got a friend there who keeps me ________.
| A．informing | B．to be informed |
| C．informed | D．being informed |
If the firefighters ________ in time, the fire would have resulted in many deaths in the hotel.
| A．wouldn’t have arrived | B．hadn’t arrived |
| C．didn’t arrive | D．shouldn’t arrive |
_________ development of nuclear weapons is _________ threat to mankind.
| A．The; a | B．The; the | C．A; a | D．A; the |
— May I use your new dictionary? I want to look up a word．
— It’s over there. ________.
| A．No problem | B．Got it | C．Feel free | D．It depends |
Last year I applied to Princeton University. I ________ they would say yes — but they did, and now here I am．
| A．never think | B．am never thinking |
| C．have never thought | D．never thought |