用括号内所给单词的适当形式填空。

1．In big cities，there are many tall __________ （building）．

2．I’ll probably go __________ （skate）and swimming next year．

3．My cousin was _________ （write）a letter to her mother when I saw her．

4．In English．I’m __________ （good）at reading than listening．

5．My grandparents are over eighty，but they are in good ___________ （healthy）．