题目内容

There is a wealth ____ information available online about the research we are undertaking.

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Exercise is necessary. Regular exercise can make us healthy and keep us ____ getting sick or overweight.

When all the lights had been left far behind him, there was nothing ____ darkness on either side of the road.

Some people attributed the decline in the number of cinema audience ____ the popularity of the television and the Internet.

To me, it's almost impossible to concentrate on work and care ____ a young child at the same time.