—What do you like doing in your free time?—I like playing cards and Chinese chess.
He watched TV for an hour. At 8 o’clock he stopped _______ his homework.
He didn’t go to bed _______ his mother came back.
It is ___________ to hold the water.
You must have breakfast, _________ you may have a stomachache.
It is difficult ________me _______ English well. But I’ll study harder.