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（）是一项人为加在项目末端而不回在任务间隔上的任务，即给项目增加一个储备时间。

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在ＡＤＭ网络图中，有时为了表示逻辑关系，需要设置一个虚活动，虚活动是不需要时间和资源的，一般用（）表示。

Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections.Section ADirections: In this section, there are 10 incomplete sentences.21. It is curious how children always behave much worse when they are _____ holiday.

A. on
B. in
C. at
D. for

22. Last week, I got a copy of New English 900 at a bookstore; after I read it, I went on _____ theNew Concept English.

A. reading
B. in reading
C. to read
D. read

23. It is perhaps not generally realized _____ to make really accurate translations of high technical material.

A. how difficult it is
B. how difficult is it
C. how it is difficult
D. how is it difficult