Tham Gia Group Dành Cho Lớp 11 Chia Sẻ, Trao Đổi Tài Liệu Miễn Phí
6. Do you know that environmentalist
A. with that
7. Have you ever
A. segn or heard
8:Exposure to pollution can cause many serious ilinesses
A. leading
9. No one is indifferent to praise,
A. are they
10. The scientists
A. researched
I used to work?
C. witlh who
D. with whorn
B. with wh ...