The country is trying their best to realize the four modernizations.

　7. sometime（过去或将来的）"某时"

　sometimes "有时"

　some time "一段时间"

　-When did your father come back? -Sometime last week.

　I stayed in Beijing for some time, then I left.

　Sometimes they play football.

　8.take off "脱下", "起飞"

　9.pick up"接受", "捡起", "买", "（顺便用车）来接", "（无师自通地）学会"

　He picked up an old car in the market yesterday.

　The children can pick up the programs at home with a two-way radio.

　When he was in the United States, he picked up English.

　Homework:

1. Unit Revision: P63: Period 4.

2. Preview "Grammar and usage".