单项选择题
I just received a proposal（）
A. that you have finalized the delivery dates. B. to be more flexible over terms of payment. C. that is made with certain conditions. D. that could benefit both of us.
单项选择题 We use our tongue to（）.
单项选择题 She said that she wouldn't mind（）the typing work for you.
单项选择题 In those early days, the boy company's（）business was model railways and cars.
单项选择题 She（）mail the package before the post office closes.
单项选择题 The seller was trying to sign a substantial order（）
