（届天津市十二区县重点校高三第一次模拟联考英语试卷）
The course normally attracts 20 students per year, ____ up to half will be from overseas.
| A．in which | B．of whom | C．of which | D．for whom |
I don't skate now, but I___________ when I was a kid.
| A．used to | B．am used to it | C．sued | D．used to do |
We liked the oil painting better____________ we looked at it.
| A．as | B．while | C．the | D．the more |
If human beings had been a bit less greedy and cruel, more birds and animals _____dying out.
| A．ought to avoid | B．could have been avoided |
| C．should have avoided | D．might have avoided |
We must keep our room clean. Dirt and disease go _____, you know.
| A．from time to time | B．hand in hand |
| C．step by step | D．one after another |
--Could I use your bike, Jack?
--Of course, you____________.
| A．can | B．may | C．could | D．might |