20. This tool is dangerous………it is used carefully.
A. whether B. if C. unless D. or
Question III: Identify the one underlined word or phrase that must be changed in order to
make the sentence correct. (2 pts)
Bạn đang xem 20. - DE DE XUAT CHON HSG CAP HUYEN MON TIENG ANH THCS YEN LUONG