1．The more you hear different accents，the easier it is to catch_on.你听到越多不同的口音，你就越容易学会。

　　[归纳拓展]

　　catch on学会；理解；受欢迎，流行起来

　　catch on to sth.(＝understand sth.)理解某事物

　　catch up with赶上

　　catch sight of看见

　　catch one's attention吸引某人的注意

　　catch hold of抓住；抓牢

　　(1)He invented an electric car，but it never really catches on.

　　他发明了一种电动汽车，但是这种车从未真正流行起来。

　　(2)It took her a while to catch on to what we meant.

　　她想了一会儿才明白我们的意思。

　　[即时跟踪]

　　介、副词填空

　　(1)I don't quite catch on to what she is saying.

　　(2)You'll soon catch up with us if you hurry.

　　(3)This new song failed to catch on with students.

　　完成句子

　　(4)I suddenly caught_sight_of her in the crowd.

　　我突然在人群中瞥见了她。

　　2．I'm sorry，but we have to keep_to the timetable，sir.

　　对不起，先生，我们得遵守时刻表。

　　[归纳拓展]

　　keep to 遵守，信守；坚持 (to 为介词)

keep (sb./sth.) away (from sb./sth.)(使某人/某事物)不靠近(某人/某事物)