Tìm lỗi sai và sửa:

Facebook is one kind of sociable networks, which attracts a lot of users worldwide.

                                            A                           B         C                                   D                   

Tìm lỗi sai và sửa:

She has made a lot of research into the effects of air pollution on people's lives on a global scale.                      A                          B                      C                                                                     D

I'll have to do overtime tonight, ________ is very tiresome.

A. which

B. what

C. that

D. so

Rewrite sentence: Use between 2 and 8 words, including the word given:

If you changed your mind, you'd be welcome to join our staff.

-> Were you __________________________ delighted to have you on the staff.