Unit 6 When was it invented? Grammar Focus 练习题一、根据句意，用括号中所给单词的适当形式填空。 1．The photo ____________(take) ten years ago.2．Basketball is a game that is ________(play) indoors and outdoors.3．A talk on English history ______________(give) in our school hall next week.4．You won't go out until your homework _____________(finish)．5．Many foreign films _______________(show) on TV since last month.二、语法填空。 What do you think is the 6. _____________(important) inventions in the world？The TV？The printing？The telephone？Or the computer？A report shows 7._____ they are not the only important inventions. Here are 8._______________ other important inventions. One of the simplest 9.__________ (invention) is the toilet. Before toilets，waste ran into rivers from people's houses.10.__________ (ill) were common in big cities，and it was often difficult 11. _________(find) clean drinking water. Animal food is another important invention. Before the invention，most animals 12. _____________(kill) every autumn because there was not enough food for them 13.___ winter. After hay (干草) became a kind of comm |
