1 . We could not hear what he said because he didn’t speak________(大声地)enough．

2 . Linda is clever. She can work out that math problem ________ (easy).

3 . Don’t talk l________ in the museum.

4 . In class, you should listen _________ (care) to the teachers or you will miss something.

5 . He is so smart that he can work out the math problem _________ (easy).

6 .

6 . Can you speak l________? I can’t hear you.

7 . Another person was hurt by the tiger in the zoo. So people must take rules ________ (严肃地).

8 . It's very important for us to listen to the teacher ________ (care) in class.