Which sentences are correct in exercise B?

1) a) Timmy is asking a lot of questions now. 2) a) He often reads a book. 3) b) Listen! Mum makes a cup of tea. 4) b) Look! The boy is making a snowball. 5) a) Look! Stan is doing magic tricks. 6) a) Listen! The girls are making a lot of noise. 7) b) We never play the drums. 8) a) Dorothy helps with the cooking in the afternoons. 9) a) They always go to school by bus. 10) a) Andy repairs things at the moment.