Tom needs some help ________ his homework. Can you help ________

Mary couldn’t make herself _______ attention to because her classmates made so much noise

. It was not until Maggie had arrived at her office _____ her appointment with the doctor.

下列各句中，加横线的成语使用不恰当的一项是

came all the way to inform you of the time and place of the meeting. —You could have _____ yourself the trouble.