这些问题只有答案，没有解题的理由，希望各位高手们帮小弟解释一下，请从语法和考点的角度来解释。
1.-The famous singer was given 1000 dollars for a single______.
A.appear B.appearance. c.disappear D.disappearance
答案：B
2.-So you mean i have been too strict with you?
-Well,if i_____say so
A.must B.mustn't C.needn'tD.may not
答案：A
3.-Students today are writing_____of poetry.
A.a great many lines B.quantities of lines C.Lots lines D.a large number
答案：A
4.You unknock the door_____turning the key_____right.
A.by;to B.by;on C.in;on D.in;to.
答案：A
5.As a result of heavy snow，the highway has been closed up until further______.
A.news B.information C.notice D.message
答案：C
6.Good technique in medicine means less pain and fewer deaths and,____,it is our duty to master it.
A.altogether B.there for C.otherwise D.however
答案：c
7.Mother was worried because little Alice was ill,especial_____Father was away in France.
A.as B.that C.during D.if
答案：A
8._____is done cannot be undone.
A.How B.That C.What D.Where
答案：C
9.Take care ____you don't make mistakes in the coming exam.
A:of that B.about that C.for what D.that
答案：D
10.___we can't get seems better than _____we have.
A.What,what B.What,that C.That;that D.That;what
答案：A
11.___might be expected,the response to the question was very mixed.
A.As B.That C.It D.What
答案：A
12.I shall never forget those days_____I lived in the army with the soldiers,_____has a great effect on my life.
A.that;which B.When;which C.when;that D.which;that
答案：B
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