10.保护环境是我们的责任。
to protect the environment. 11.我们应当把这个难题当作一次新的挑战。
We should the problem a new challenge. 课后练习 Ⅰ.单项选择
（ ）1.I was angry with Tom.So I decided to our friendship.
A.break down B.break off C.break into D.break through （ ）2. the help Of our teachers，we can organize the party. A.Under B.Using C.By D.With
（ ）3.You won’t succeed you work harder than before. A.if B.unless C.whether D.why （ ）4.Things will get easier as time .
A.past B.went by C.goes by D.have passed （ ）5.P1ease don’t waste money on the clothes.
A.too many B.too much C.much too D.many too Ⅱ. 阅读理解
We are 1earning English，but how can we 1earn English well?A student can know a 1ot about English，but maybe he can’t speak English.If you want to know how to swim，you must get into the river.And if you want to be a football player，youmust play football.
So you see，you can learn by using it. You should 1isten to your teacher in class.You should speak English to your classmates every day and also you could write something in English.Then one day you may find your English very good.
（ ）6.You know a lot about English，but maybe it.
A.you can speak B.you can study C.you can’t speak D.you can’t study （ ）7.You must go into the river .
A.to 1earn how to swim B.to skate C.to jump D.to play （ ）8.Do you want to be a football player?P1ease !
A.buy a football B.play football C.have some lessons D.read some books （ ）9.You can 1earn by using it. Fore eample， . A.1isten to your teacher inclass
B.speak Englis