Make all the necessary changes and additions to produce a complete sentence from each of the following sets of words and phrases.
13. How long / you / know / each other //
14. I / prefer / play football / swimming //
15. I / not cook / well / my mother //
16. Alice / used / play / piano / night //
17. How long / it / take / you / do / homework / everyday //

​Complete the unfinished sentence in such a way that it means the same as the sentence printed beford it.
18. They speak English in Australia.
=> English
19. I will only go to bed when I have finished my homework.
=> I won't
20. The light went out at the time we were having dinner.
=> We were
21. "You have to take him to hospital or he'll die."
=> "If you don't
22. "I am very busy, I can't talk to you now."
=> I am too