.--- Do you know Uncle Tom is crazy about gardening?---Sure. He ____ his flowers in the garden now.
Oh, it’s so cool in the house. You _______ have turned on the air-conditioner, haven’t you?
Fathers often feel __________ their duty to earn more money for their family.
--- ________ the class done most of the work? --- Yes, but the rest ___________ rather difficult.
The problem lies __________ we are now giving him a fish, not teaching him to fish.
We were lucky to have survived the train accident. _____, the first and last car were smashed.