A.Xảy ra hiện tượng đá lở, đất trượt.
B.Bề mặt địa hình bị cắt xẻ mạnh.
C.Đồi núi chiếm 3/4 diện tích lãnh thổ.
D.Hình thành hang động ở vùng núi đá vôi.

A.Pu Đen Đinh.
B.Đông Triều.
C.Tam Đảo.
D.Tam Điệp.

A.Gia Lai.
B.Quảng Nam.
C.Kiên Giang.
D.Kon Tum.

A.Tỉ trọng sản lượng khai thác thuỷ sản ngày càng tăng.
B.Sản lượng khai thác cá biển chiếm tỉ trọng lớn.
C.Khai thác thuỷ sản nội địa chiếm tỉ trọng nhỏ.
D.Sản lượng khai thác thuỷ sản ngày càng tăng.

A.All the guests will have dinner when we arrive tonight.
B.By the time we arrive, all the guests will start dinner tonight.
C.All the guests will be having dinner by the time we arrive tonight.
D.By the time we arrive tonight, all the guests will have started dinner.

A.John was reminded to train harder so as not to be dropped from the team.
B.The captain threatened to drop John from the team unless he trained harder.
C.The captain urged that John should train harder in order not to be dropped from the team.
D.The captain promised to drop John from the team in case he trained harder.

A.Perhaps he speaks English well as he has lived in England since his childhood.
B.He may speak English well as he has lived in England since his childhood.
C.I am sure he speaks English well as he has lived in England since his childhood.
D.He speaks English well though he has not lived in England since his childhood.

A.If I didn't make two minor mistakes, I would have got full marks for the test.
B.I would have got full marks for the test if there hadn't been two minor mistakes.
C.Had I made two minor mistakes, I would have got full marks for the test.
D.If the mistakes hadn't been minor, I could have got full marks for the test.

A.If I didn't make two minor mistakes, I would have got full marks for the test.
B.I would have got full marks for the test if there hadn't been two minor mistakes.
C.Had I made two minor mistakes, I would have got full marks for the test.
D.If the mistakes hadn't been minor, I could have got full marks for the test.

A.Since the substance is very toxic, so protective clothing must be worn at all times.
B.So toxic is the substance that protective clothing must be worn at all times.
C.The substance is such toxic that protective clothing must be worn at all times.
D.The substance is too toxic to wear protective clothing at all times.