用方框中单词的适当形式完成句子。

eager ，charge ，approach ，announce，surround，ensure，belong ，legal

（1）It is

illegal

illegal

to sell tobacco to someone under 16 in this country.
（2）The man

charged

charged

with murder was under investigation.
（3）The house destroyed in the big fire

belongs

belongs

to Mr.Green.
（4）The

announcement

announcement

of their engagement took us by surprise.
（5）The shell

surrounding

surrounding

the egg has many important functions.
（6）With Christmas

approaching

approaching

，everyone was busy shopping.
（7）As Louis grew older，he became

eager

eager

to learn than his siblings.
（8）Before gliding（滑翔），the instructor did a complete check

to ensure

to ensure

everything was secure.