3.(　　　 )top of the hill is standing a house.

2.Cut (　　　 )the meat,and you can make dumplings (　　　 )it.

1.The baby is sleeping,please turn (　　　 )the radio.

5、青少年不应该被允许吸烟。

4、如果我去美国了你该怎么办？

3、我过去不常去美国。

2、对我来说，学好英语是不容易的。

1、每天早晨读英语是学好英语的好方法。

43..There are three policemen are (　　　 )duty all day and all night.

42.You should be serious (　　　 )your marriage.