【题目】 _______ the course very difficult, she decided to move to a lower level.

【题目】— Students should devote most of their time to studying instead of playing computer games.

【题目】Group activities will be organized after class _______ children develop team spirit.

【题目】A number of books in the library _______been stolen so the number of them_______ smaller than before.

【题目】The two sportsmen congratulated each other winning the match by shaking hands.

【题目】The building windows are bright at night is our school library.

【题目】This task is too hard for us and ________ will be needed if it is to be finished on time．

【题目】— The problem is very difficult. I'm afraid you can't work it out now.

【题目】Slavery was ______ in the U. S. in the 19th century, and slaves were given equal rights.

【题目】听下面一段较长对话，回答以下小题。