Find and correct ONE mistake in each

III. Find and correct ONE mistake in each sentence

16. Let’s wait for her; I’m sure she has turned up before long.                   …………………………..

17. Little orange juice will make the soup taste  better.                            ………………..…………

18. If you buy your ticket on advance, it’s often cheaper.                         ……..……………………

19. I’d like  to take a two- weeks  holiday.                                              ……………..……………

20. The White House, where the US president lives in, is in Washington.  ..…………………………