sight，volunteer，select，debate，rainbow，subscribe，stage，topic，figure，opportunity
（1）Becoming a

volunteer

volunteer

will be useful to develop your social experience.
（2）The heated

debate

debate

about the safety problems drew attention of the local government.
（3）The discussion came alive when an interesting

topic

topic

was brought in.
（4）The

opportunity

opportunity

is not easy to grasp so you should work hard and be well prepared.
（5）I

figure

figure

it is worth your effort.Don't give it up so easily.
（6）My son wanted to

subscribe

subscribe

to China Daily for a year.
（7）The old woman was careful to

select

select

what she needed most.
（8）The bird caught

sight

sight

of the worm and managed to catch it.
（9）It is the first time that the little girl has seen the

rainbow

rainbow

in the sky.
（10）The world is like a

stage

stage

and we each must play a part.