1) Who is she? a) She is a doctor. b) She is a scientist. 2) What does he do? a) He does experiment in the laboratory. b) He does experiment in the library. 3) Is a knife dangerous? a) No, it isn't. b) Yes, it is. 4) Are goggles safety equipment? a) Yes, they are. b) No, they aren't.

Bảng xếp hạng

Phong cách trực quan

Tùy chọn

Chuyển đổi mẫu

Bạn có muốn khôi phục tự động lưu: không?