题目内容：

根据所给的句子以及汉语释义，用所学过的单词或短语完成句子，每空一词。

1.________ ________ ________(直到现在)，we have finished Book 4.

2.We are not allowed to ________ ________(参考)our notes in the exam.

3.His laziness can perfectly ________ ________(为…做出解释) his failure.

4.No one knows exactly how the fire ________ ________（爆发）last night.

5.Women are still being ________ ________ ________（看不起）in some areas.

6. It was hard for him to ________ ________ (挑出)his teacher in the crowd.

7.Keep on working like this and you will succeed ________ ________(迟早).

8. ________ ________ ________ I know (据我所知)，he is from America.

9.They ________ ________ ________(屏住呼吸) and watched the cat closely.

10.With so many animals ________ ________(灭绝)，the environment is becoming worse and worse.