The boy’s bad behavior at school __________ his mother many sleepless nights.
The top of the hill is _________,but the trees grow part way up its slope.
Happy birthday,Alice!So you have __________ 21 already.
Don’t leave matches or cigarettes on the table within __________ of little children.
Pop music is loved by lots of people,but it is not to everyone’s _______.
—What’s the matter,doctor?—Nothing serious.Take this medicine according to the __________,and you’ll get better soon.