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).