? that.?The reason he explains to me is 2.?unreasonable.He could’t give the teacher a good reason ?? he was late for school. There are several reasons we can’t do 3．whic
h，without which，in which
幻灯片15 四、语法填空
When you are in England you must be very careful in the streets __1__ the traffic drives on the left. Before you cross a street you must look to the right first __2__then the left. In the morning and in the evening __3__ people go to or come from work，the streets are very busy. Traffic is most __4__ (danger) then.
When you go by bus in England，you have to be careful，__5__.Always remember the traffic moves on the left，__6__pedestrians also walk. Have a look first，__7__ won't make you go the wrong way.
In many English cities，there are big buses __8__have two floors. You can sit on the __9__ (two) floor，__10__ you can see the city very well. It's very interesting. 幻灯片16
1．解析：because 引导状语从句，说明你必须小心的理由。 答案：because
2．解析：and 连接两个并列动作。 答案：and
3．解析：when引导定语从句。 答案：when
4．dangerous 5.too
6．解析：where 引导定语从句，在定语从句中作状语。 答案：where 幻灯片17
7．解析：which 引导非限制性定语从句，指代前面整个主句的内容。 答案：which
8．解析：关系代词引导定语从句。 答案：which/that
9．解析：the后需跟序数词，所以用 second。 答案：second
10．解析：where引导非限制性定语从句。 答案：where 幻灯片18
?is important and necessary to our human ?beings.3.?The colorless gas is called oxygen， we could not live.?The colorless gas is called oxygen， ? fires burn much better.您 祝
The colorless gas is called oxygen，