用括号中单词的适当形式填空。
1．Let’s go ___________（shop）now，Mary．
2．Look! A tiger is running after some ____________（sheep）
3．How many ___________（hour）do you sleep every night?
4．There are _____________（many）girl students in Class 2 than in Class l．
5．His father takes exercise every day，so he is very __________（health）
6．If you want to play the piano very well，you must __________it every day（practice）．
7．Although they are twins，there are some differences between__________．（they）
8．I live in a town __________Alice Springs．（call）
9．In big cities，students usually _________bikes to school or take buses．（ride）
10．My mother hardly ever __________exercise，so she isn’t in good health．（take）