You stepped into the lab with your shoes on? You’re _______ to take them off before you enter it.
I _______ Beijing in a few days. Do you know when the earliest plane ________?
---We won the English Contest last week, Mum. -----_______.
His wife, to whom he_______ for 20 years , was childless.
—Hi , Tracy , you look tired. —I'm tried. I ______ the living room all day.
One side of the board should be painted yellow, and_______