_______ was known to them that the boss had broken hispromise______ he would give them a rise

I won’t tell the student the answer to the math problem until he _____ on it for more than an hour.[ ]

are in trouble , Mike is always willing to_______ a hand .

The media can often help solve problems and draw attention﹍﹍situations﹍﹍help is needed.

You look tired these days. I think you need a________sleep.