1 . These mountains are a splendid sight when ________ (view) from the valley floor. (所给词的适当形式填空)

2 . After his parents passed away one by one, the little boy was left ________ (burden) with the responsibility of the whole family. (所给词的适当形式填空)

3 . I usually have fast food _________ (deliver) to my office. (所给词的适当形式填空)

4 . With dinner ________, my mother went on to water her vegetables.

A．had prepared

B．prepared

C．preparing

D．to prepare

5 . Children are advised to drink as much ______ (boil) water as possible, which is favorable to their health. (所给词的适当形式填空)

6 . C________ with those who are always complaining, people who are optimistic and outgoing live longer. (根据首字母单词拼写)

7 . ________________，we began our holiday.
考试结束了，我们的假期开始了。

8 . 那封寄给我们经理的信不见了。
The letter ________disappeared.

9 . ________________ (激励) his uncle’s encouragement, he promised to do his best to live up to his family’s expectations. (用非谓语结构) (根据汉语提示完成句子)