1 . Sorry to say I’m busy now and can’t help ______ the lab.

A．to tidy	B．tidying
C．being tidy	D．but tidy

2 . 语法填空
1. Modern methods oftracking polar bear populations have been employed only since the mid-1980s, and are expensive_____(perform) consistently over a large area.
2. I quickly lower myself, ducking my head to avoid_____(look) directly into his eyes so he doesn’t feel_____(challenge).

3 . Surprisingly, we found that in 30mph zones older drivers struggled to _________ (keep) at a constant speed.(所给词的适当形式填空)

4 . Preparations are being made for the Olympic Games ______ in Brazil in 2016.

A．held	B．to hold
C．to be hold	D．holding

5 . Today I have a composition _________________(要写). (to)

6 . 这男孩太小了，还不会自己穿衣服。(根据汉语提示完成句子)
The boy is_______________________．

7 . The guy next to me tried to talk to me the whole time, which made me hard to c_____ on the experiment. (根据首字母单词拼写)

8 . Tom was the first man _______ after the accident.

A．questioned	B．to question
C．to be questioned	D．being questioned

9 . What troubled the teacher was that no one present made an answer when asked who had broken the glasses, so he didn’t know who        .

A．was blamed	B．was to be blamed
C．would be blamed	D．was to blame

10 . At first my new surroundings were difficult to _________(忍受).（根据汉语意思填空）