choosethe best answer. câu1:are you aware the time? A:at. B:in. C:on. D:of. cau2:the museum is now open all visitors. A:with. B:to. C:on. D:for. cau3:smoking is harmful your health. A:at. B:in. C:to. D:in. cau4: are you afraid snakes. A:to. B:out. C:on. D:of. cau5: is she serious learning to be a pilot. A:about. B:in. C:up. D:over. cau6: is this matter important you? A:at. B:to. C:off. D:on. cau7;I just couldn't believe what he said.It was contrary his thought. A:from. B:in. C:out. D:to. cau8: Don't give up hope yet. be con fident a success in the future. A:at. B:for. C:on. D:of. cau9: make yourself useful others. A:at. B:to. C:about. D:of. cau10:it's very kind you to help them. A:at. B:in. C:on. D:of. cau11:he said he had given drinking. A:out. B:to. C:by. D:up. cau12:don't put until tomorrow what you can do today. A:off. B:up. C:of. D:in. cau13:what does NATO stand ? A:for. B:by. C:up. D:to. cau14:If the train is late , we to the office. A:walk. B:will walk. C:would walk. D:walks. cau15:she if she has time. A:calls. B:would call. C:will call. D:calling.