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).