He is so busy.He cannot afford enough time with his son________he wants to.(2013·四川，7)
| A．even if | B．as if |
| C．because | D．before |
.Think about ___ you enjoy doing, and look for others that enjoy it too.
| A．what | B．which | C．that | D．whether |
---Jack，do you mind if I use our computer for a while?
---Not at all.___.
| A．You’ll use it. | B．Go ahead. | C．Come on. | D．Take it easy. |
— I have got a headache.
— No wonder. You___________in front of that computer too long.
| A．work | B．are working | C．have been working | D．worked |
The expert insisted that silkworms were first raised by a woman in___________is now Hebei Province.
| A．which | B．that | C．where | D．what |
My grandfather is as ___________as a young man and hates sitting around doing nothing all day.
| A．enthusiastic | B．energetic | C．talkative | D．sensitive |