The man said he would accept the job on the phone, but we’d better _____ his acceptance in written form. [ ]

It is required that he________homework tomorrow morning.[ ]

Our car ___________ on the way to the valley, so we had to wait for rescue.

Dr Yuan Longping grows _____ is called super hybrid rice, _____ has a high output.

What were you doing when I called you at 8 p.m. yesterday —I the piano at that time.