The frightened thief hid himself in the dark corner of the yard, ____, staring at the open door.

_____ energy, shut off the hot water after you take a shower.

The good thing about children is that they ______ veryeasily to new environments．

On April Fools’ Day, Westerners play tricks on each other on the basis of the rule for the jokes: they ________ be fun and ________ hurt anyone’s feelings.

Is Mr Wang your English teacher, Li Lei —- ___________.