用所给词的适当形式填空。
1. He is now in the __________ (sit) room
2. It's very __________ (friend) to say "Hello" to others.
3. He is not good at__________ (swim), but he is a good _________ (climb).
4. The black shoes are__________ (make) of leather.
5. I don't know what___________ (wear)?
6. These cards are old. I don't want to buy_________ (their).
