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?