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18. iron-doing
19. wakes
còn lời giải chi tiết thì... mk ko biết .-.
1, The homework is too difficult for him to do
2, The homework isn't easy enough for him to do
3, The homework is so difficult that he can't do it
4, It is such difficult homework that he can't do it
1. My sister says she went to school by bus this morning.
My sister said she had gone to school by bus that morning.
2. Nga says she have done her homework.
Nga said she had done her homework.
1, My sister says that she goes to school by bus this morning
My sister said that she had gone to school by bus this morning
2, Nga says that she have done her homework
Nga said that she had done her homework
11 wasn't invited
12 were paiting
13 hasn't had
14 will be sent
15 was equipped
1A
2C
3B
4B
5D
6A
7B
8A
9B
10B