Mother told Jim to watch the milk until it boiled and then _____ off the gas.

 The storm, which was called “Fierce Tiger”, ________ the village in ruins overnight, making many people homeless.

The naughty boy who _____ in bed ____ to his parents, saying that he was ill and  couldn’t go to school.

Obviously, the old soldier’s knowledge of English＿＿＿very weak. 

Changing the design of a new product may ______ the risk of its production in the market.