1 . Hard ________ she tries, she can hardly avoid mistakes in her homework. (用适当的词填空)

2 . Nowadays, many big cities have given up this custom ________ ________ ________ ________ ________.
现在为了避免污染，很多大城市不再有这个风俗。

3 . 人应该从过去的错误中吸取教训，以免重蹈覆辙。(so as to do)
One should learn from the past mistakes ________________.

5 . 避免讨论更容易，但冒险讨论最终可能会带来更好的结果。
________________, but risking talking about it may eventually lead to a better outcome.

6 . 避免讨论更容易，但冒险讨论最终可能会带来更好的结果。

_______________, but risking talking about it may eventually lead to a better outcome.

7 . 避免癌症的关键是拥有健康的生活方式。
The key to________is to have a healthy lifestyle.

9 . During the Mid-Autumn Festival, families gather to________(欣赏) the moon and enjoy delicious moon cakes.

A．admire

B．avoid

C．collect

D．steal