The climate in Chengdu is warmer than______in Harbin.
Driving a car is not as difficult as you imagine, if you __________ the rules.
A good idea __________ to me,and I quickly picked up the phone to tell Jack about it.
So suddenly __________ that people had no time to escape.
I happened __________ with him when he was hit by a stone.
You'd better not phone me between two and six o'clock this afternoon; I __________ a speech then.