4) a: how often ( you \ clean) your room? b: once a week. 5) a: lisa ( study) hard these days. b: i know. she ( want) to pass her exams. 5) a: you (look) terrible, what's wrong? b: i (have) a terrible headache.

4a How often do you clean...?
5a is studying
5b wants
5a are looking
5b I am having

A how often do you clean your room?
B once a week
A lisa is studying hard these days
B I know. She wants to pass her exams
A you look terrible, what is wrong?
B i am having a terrible headache