单项选择题
Please help yourself to the fish.（）
A.Thanks, but I don't like the fish. B.Sorry, I can't help. C.Well, fish don't suit me. D.No, I can't.
单项选择题 Peter worked so fast with the maths problems（）a lot of mistakes
单项选择题 People at the party worried about him, because no one was aware（）he had gone
单项选择题 Paul, this is my friend, Ann.（）
