1.After listening to the news on _____ radio, she began to practise playing ______ violin for an hour.
A./,/ B.the, the C. the,/ D./, the

2.The sheep _____ farmed for meat by the old man, which is said to ____ by a scientsit.
A. is; be bought B. are; be bought
C.were;have been bought D.was;have been bought

3.It is no longer a question ____ we will finish the work in two hours.
A.that B.which C.whether D.what

4.It seems that you cannot move the case alone. Shall I lend you a helping hand?
---Thank you.________
A.If you are convienent
B.It couldn't be better
C.I can manage it myself
D.If you like

5.--Hi,Cater.Nice to see you bace. How long___ you ____ in the city of Beihai?
--Three days. That's a nice city.
A.have;stayed B.did; you
C.had;stayed D.do;stay


6.Where was Mr.He this morning?
I'm not sure,but he______ to see Susan, who is said to be seriously ill.
A.must go B.can have gone
C.should have gone D.must have gone


7.______ she stopped there was a sign____ "Staff only."
A.Where;reading B.When; reading
C.Where;read D.When; saying


8.Only after they themselves came to China____
was really not what they had expected.
A.had they realized B.did they realize
C.they realized D. they will realize

1B
on the radio = on the air 通过电波/广播
play + the + 乐器，play + 球类运动

2D
从后文（which指代的就是sheep，而其后is）判断，此处sheep是一个单数概念，因此第一个空格用第三人称单数。
另外，由于buy发生在say之前，所以要用动词不定式的完成形式。

3C
此处是一个同位语从句，它成分齐全，含义完整，但语气不肯定，故当用whether。

4C

5A
How long问句必须用完成时态，又从后文（that's a nice city）可知，他仍在北京，所以用现在完成时。

6没有正确答案
从前文（I'm not sure）排除了A和D（must表示的是肯定性推断），B用不能用于肯定句（can表示猜测时只能用于否定句或疑问句），但是C表示的是“应该做某事而事实上没有做”，显然和句意所要表达的“去了苏三家”的意思不相符。
如果面前要选一个只能是B了。

7A
where引导的是一个地点状语从句，以满足there be句型结构的要求（There be + 真正主语 + 地点状语）（这里地点状语提前了）。
reading是现在分词作定语，由于sign和read是主谓关系，所以只能用现在分词，而不能用过去分词。
此处read是“上面写着”的意思，所以不能用say。

8B
“only+状语”前提到句头，主谓要部分倒装（即助动词、情态动词要放在主语之前，而行为动词仍放在主语之后）。
题目中在was前应该少了一个成分，可能是个it之类的词。