Câu 1 sửa were => was
4 Jeans were worn by many university students in the 1960's
5 The window was cleaned by Jack last week
6 We were given a lot of presents by the teacher
7 Mary hasn't been seen since 3 o'clock
8 The washing machine has been designed by famous engineers
9 A new style of jeans has just been made by the fashion designer
10 A new station will be built here
11 The report has to be finished today
12 All the school in the city might be improved by us
13 Experiments on animals should be stopped by scientists
14 Mary and Tom are going to be given some new books by Mr Pike
15 Five million bottles of Champagne will be produced next year
16 This exercise must be done carefully
17 The problem can be solved easily
