用所给词的适当形式填空。

1．Please open the window．There is an               （pleasant）smell in the room．

2．Students should have enough free time             （relax）．

3．Jay has lots of hobbies,             （include）dancing, singing and playing soccer．

4．--Would you mind my           （smoke）here?

--Better not．

5．We should give them         （free）to do what they like best．