希望大虾们给出答案的同时解释一下，不胜感激！
1.I'll pass on your comments to the people( ).
A.concerned B.connected C.relating D.protested
2.If the orchestra met his demand,he will weep ( )joy.
A.in B.to C.for D.about
3.--What does the sign over there read?
--"No person( )smoke or carry a lighted cigarette,cigar,or pipe in this area."
A.will B.may C.shall D.must
4.Why not try your luck downtown,Bob?That's( )the best jobs are.
A.why B.what C.when D.where
5.The blue sky( )a fine day today.
A.signals B.promises C.provides D.offers
6.By serving others,a person focuses on someone other than himself or herself,( )can be very eye-opening and rewarding.
A.who B.which C.what D.that
7.Today,we'll discuss a number of cases( )beginners of English fail to use language properly.
A.which B.as C.why D.where
8.--When has the country been open to international trade?
--( )1978,I suppose.
9.contiuos和continual的区别．
10.In my opinion,life in the 21th century is much better than( ).
A.that used to be B.it is used to be C.it was used to be D.it used to be
11.I would support( )decision he made.
A.whatever B.no matter what C.whichever D.no matter which
12.He stayed up late( )the test the next day.
A.preparing for B.to prepare for C.prepare for D.prepared
13.After graduation she realized a point in her career( )she needed to decide what to do.
A.that B.what C.which D.where
14.It is reported that are usually some( )before an earthquake.
A.symbols B.marks C.signals D.signs
15.Hearing the news,she( )by getting very angry.
A. reacted B.recollected C.recalled D.reflected
16.( ) the text a second,the main idea of it will become clearer to you.
A.While reading B.If reading C.Your having read D.When you read
17.charge,blame,accuse的区别。