I.
1--20  CDCAB   ABCCB  DBDBC  DDBAA

II.
21. was, was
22. are, is
23. has there, doesn’the
1.plural only: poultry, thanks, contents
both singular and plural: species, headquarters, sheep
2.roll, board, grain, ray
3.no, little
4.is going to be, will be
5.hadn’t been, would have
hadn’t been, wouldn’t have to

III.
6.did they?
7.shall we?
8.would have passed
9.arguing
10.condemned
11.to understand
12.to ask
13.were
14.started
15.from/ against
16.for
17.at
18.which
19.whom
20.what
21.and
22.before
23.because/ for
24.that
25.that

IV.
26.when 改为 that
27.of 改为for
28.was改为were
29.is 改为are
30.annoyed改为annoying
31.seeing改为 to see
32.every改为each
33.when去掉
34.but改为and
35.the front改为front

V.
36.I have never in all my life seen such a swarm of ants.
37.They must all have taken the wrong road, didn’t they?/ mustn’t they?
38.How fast they are running!
39.Don't try to expect to be rewarded with the money they promised.
40.The Bulls may not have been well prepared for the …
41.On his way up the hill Jack fell down and hurt his hands and knees, but Jimmy got to the top all right.
42.As soon as he came out of the Conference Room, reporters surrounded him.
43.She was dancing with a student who had a slight limp.
44.If he had been able to answer all the question, he would have passed the examination.
45. Noisily were the girls talking when the teacher walked in.
46.I want a car, but I can’t afford one.
47.My wife and I are going to dine out this evening. In fact, we do it every weekend.
48.Coordination is typically realized by coordinators which join units at the same level.
49.Cohesion is a semantic concept referring to the relation of meaning within the text. This relation does not come into being until we have to interpret a certain element by recourse to another.
50.The primary function of Wh-questions has two: one: they require some specific information in the reply; two, they do not query the truth of the statement as a Yes-No question does. They ask for details about a part of it.
51.can expresses the possibility in theory while may denotes the possibility in reality.
52.The past tense with reference to the present usually expressed the speaker’s attitude or hypothesis. The attitudinal use normally occurs in independent clauses expressing a less direct question, request or suggestion and implying an overtone of politeness on the part of the speaker.