Those overseas students volunteer 10 hours each week in Paris ________ free food and accommodation

Jack, is Maths difficult to learn in high school—Sure. No subject can be learned well hard work.

Please don’t bother me again. I’ll inform you of the details at an _____ time if you must know.[ ]

The WHO thinks highly of the measures all the departments in China _____ to prevent large-scale outbreak of the disease. [ ]

_______ the balls—They’re under the chair.