题目内容：

根据句意，从括号中选择恰当的单词填空。

1.There’s an age __________(different  / difference) of six years between them.

2.I __________(strong / strongly) urge (力劝) you to give up smoking.

3.It’s really __________(kind / kindness) of them to let us use their swimming pool.

4.It is getting more and more __________( difficult / difficulty) to find a job.

5.She __________(trained / training) hard for the race, sometimes running as much as 60 miles a week.