用所给动词的适当形式填空
1.Wh en ( )(be)your brother born? He ( ) (be) born in July 1989.
2.They ( ) (sing) a song in English for us at the party yesterday.
3.Why ( ) they ( ) (visit) the museum last Sunday ?
4.Tom ( ) (not do ) his homework yesterday .
5.They ( )(send) cards to their friends three days ago .
6.The girl is good at ( ) (play) the guitar.
7.They can ( ) (swim) now but they couldn't ( ) (swim) three years ago .
8.They shouldn't ( ) (take) off their shoes.