We'll do what we _____help the poor.A,can to B,can do C,can

we
句子的意思：每个人应该做我们能做的一切事情来保护环境.
/每个人应该尽一切努力来保护环境.

11.Anne _____a______ tomorrow.
A.can singB.can to singC.is going singD.going to sing
12.I think she ___c_____ right now．
A.was readingB.readsC.is readingD.is to read
13.Las Vegas,an American city,is increasing its population faster than ____b____ in the country．
A.any city B.any other city C.any another D.other city
14.Don't you know he is an old friend of ___a_____?
A.my brotherB.my brothersC.my brother'sD.my brother's friend
15.Mary _________c_______ to school.
A.never walksB.walks neverC.is never walkingD.never is walking
16.They had all been very ill-used __b________ she last saw her sister.
A.after B.since C.when D.while
17.The trouble seems to be that income tax is progressive,so that the richer you get,the less rich you are than _____a________.
A.what you think you ought to be B.what you thought you ought to be
C.what you thought you should be D.you think you ought to be
18.There isn't _____a___ at the bus-stop.
A.anybodyB.peopleC.any personsD.somebody
19.There is only one grammatically complete sentence.Please find it out.___________d__________
A.International trade refer to transactions of goods and services between countries.
B.Open to the outside world plays an essential role in the economic development of our country.
C.To be competitive,goods and services should not be confined to the domestic market
.D.The market economy is characterized by intensely competition among corporations.
20.He is one of the students who ____b____ always on time.
A.isB.areC.wasD.be
21.Many facts proved that long before Columbus __d____ America,Chinese had visited it.
A.noticed B.uncoveredC.discovered D.arrived
22.John expects __a_______ three men in the room.
A.there beB.there being C.there to beD.there been
23.I have nothing to say against him; he is ____a______ man.
A.a most interesting young B.a most young interesting
C.most an interesting young D.a young most interesting
24.The cat has _____a_________.
A.the long legsB.long legsC.the legs longD.legs long
25.Tom is good boy and ___c____ he is honest.He never tells a lie.
A.at all B.in all C.above all D.after all
26.Which of the following is correct?_____________d__________.
A.Kenn is talking to Jane and we.B.We and Jane is talking to Ken.
C.Jane and we talking to Ken.D.We are talking to Ken and Jane.
27.Stars are so far away that they are ____a_____ spots of light when seen from the earth.
A.nothing more thanB.anything more thanC.more thanD.less than
28.If you want to inform a 1arge number of people about something,you ___b______ advertise by public announcement.
A.might needB.might need to
C.need not toD.not need to
29.They would ____a___ for Guangzhou the next morning and so they went to bed early.
A.set out B.set about C.set up D.set to

情态动词：can must should shall could would等
助动词：do.did.does.done.didn't等

我将尽我所能去帮助提高你的英语水平.
do 是本句的动词,你可以把它看作从句what i can 是修饰do的