练习题：
1.The Great Green Wall will stop the wind from ________(blow) the earth away.
2.Mr Smith kept on _____ (ask) the players to remember-----TEAMWORK
3.Alice didn't hear what the teacher said just now,so she doesn't know how ____ (do) the problem.
4.The policeman asked the old granny to put down her heavy box and let him ______ (carry) it for her.
5.用help,happen,listen,have,ask,be,plant,miss,leave,look的适当形式填空:
(1).WangHai is a good comrade.He always does his best ________others.
(2).Dig the hole big enough,or the trees can’t ___________well .
(3).It's time for class.Let's stop _______to the teacher.
(4).Her face turned red when she _______ to sing a song for all of us.
(5).She is older than Mary but ________much younger.
(6).--I can't find my keys.--Maybe you ___________ them at home.
(7).We waited in the next room while they ____________a meeting.
(8).Hurry up.You __________the train if you don't.
思考题：
用 send,show,turn,cost,write,fly,get,stop,see,do,hear,go 的适当形式填空
1.____ you ___ each other since you left school ten years ago?
2.What ___they ___at 8:00 yesterday evening.
3.The Smiths are getting ready ___to Australia for their holdiay.
4.The beautiful jacket___too much , doesn't it?
5.Lucy and Lily were playing cards when they ___ a loud knock at the door.
6.The radio says the rain ___later on.
7.The boy ___to hospital as soon as the traffic accident happened.
8.Today films___in English everywhere in the world.
9.It's summer now.The days___longer and the nights shorter.
10.Mother ___ to Shanghai and she'll be back in a week or so.