We will be for ______ promises to volunteerto help us solve the puzzling problem.

下列各句中，划线的成语使用恰当的一句是 （ ）

The engineers are so busy that they have zero time for outdoor sports activities, ________ they have the interest.[ ]

Miss Lee, I didn’t catch what you said. Could youtell me ______ again—OK.

The doctors said that there was _______wrong with Jane’s legs. She could do _______to help her.