用所给词的正确形式填空。
1．There are many ________(sheep) on the hill. Some ________(child) are looking after them.
2．Whose is that bike, David? Is it ________(you)? No, It's ________(Jim).
3．We have many ________(friend), they are very ________(friend).
4．Jim can ________(swim) in the river. He often ________(swim). He likes ________(swim) a lot.
5．The twins are ________(America). They are from ________(America).
