1. is playing

2. started

3. guess - was

4. am doing

II.

1. Does your school has a compter?

2. He is interested in both maths and english

3. There are more than 500 students in Hoa's school 

4. Janet isn't interested in watching sports on TV

5. How long does it take you to learn English everyday?

1.Who(play) is playing music upstairs?It's really noisy 
2.It(start) starts  raning on our way home ,but luckily I had my umbrella  in my bag 
3.I wasn't sure of the answer so I (guess)  guess  and I (be) was  right 
4.I (do) am doing my exercise now , but I can come and help you late
II 1. Is there a computer room at your school?
⇒ Does your school have a computer room. 
2.Both maths and english are interesting to him 
⇒ He is interested in Maths and English. 
3.Hoa's school has more than 500 student .
⇒ There are more 500 students in Hoa's school. 
4.Janet doesn't like watching sports on TV 
⇒ janet is not keen on watching sports on TV. 
5.How much time do you spend learning english every day ?
⇒ How long does it take you to learn English everyday ?