完成句子( 每空1分，共20分)
Professor Yu ______  ______  ______ before ______  his speech.
于教授在演讲之前先理顺了一下自己的思路。
All the students ______  ________  _______ the Internet.
并非所有学生都喜欢上网。
The police _______ a man  _______  drowning.
警方援救一男子，使之免遭溺水。
She _______ very  _______  ________ her children’s success.
她对她的孩子们的成功感到非常自豪。
______  ______  _______ the teacher was satisfied with what you have done.
老师好像对你做的事很满意。
________  _________ families _______   ________and many children were left ________ parents.
成千上万个家庭遇难，许多孩子成了孤儿。