This is my treat and next is yours How’sthat—OK ____________

Life is not always that smooth and I hopeyou can force a laugh _________ pain.

It can be easy to _______ such bad habits as smoking and heavy drinking, but it is not so easy to quit.

Free bikes are in use(投入使用) in many places , shall we borrow one this Sunday—

___ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.