1.Black,__father of __Tom,lost his new watch.

1.Black,__father of __Tom,lost his new watch.
A./,/ B.the,the C.the,/ D./,the
2.The teacher asked__students to do homework ourselves
A.the B.his C.some D.us
3.The boy was seen __the piano at 9 yesterday evening .
A.to play B.play C.playing D.played
4.There are four pairs of socks to __,but the woman does not know __to buy.
A.choose from;which B.choose from;what C.choose;which D.choose;what
A,D,C,A.为什么呢?

1.father mother前面不用加定冠词,tom是人名,前面都不用加“the”
2.后面因为说明了ourselves是student,所以前面加us,跟ourselves相符
3.这种句型叫past continuous..也就是过去进行时.是说这个男孩子在昨天9点的时候正在弹钢琴..所以用was playing
4.在这个情况下choose后面要加介词,用以表明“从4双袜子中选择”（如果问题是there are four pairs of socks FOR HER TO____,则横线上只填choose).这里,妇人是从4双袜子中“选”一双,用which..如果是从不同类的物品中选择,这时候则用what.
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