erson has not had enough sleep,hisactions will give him ___ during the day

What the doctor really doubts is ______ my mother will recover from the serious disease soon.

Although she didn’t know the best way of getting to places, she insisted that she ____________ the trip properly.

He disappeared last month, _______ we have heard nothing of him.

If you successfully complete a difficult task ________ hard work, you’ll become confident.