—What’s the weather like outside?—It’s raining heavily . You’d better not go out.
Don’t be afraid of asking for information ______it is needed.
I want to know ______ do to help my neighbour.
It’s important ______ the piano well.
This kind of food _____ cool, clean and dry according to the instruction.
一Have you mended your shoes,Bob? 一Yes , I ______ them twenty minutes ago.