Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
This river is so big that it is impossible to build a _______under it without modern technology.
The college students in China are _______ from smoking on campus because this will do them no good.
Muchofthenewsprovidedbythisnewspaperis_______,notforeign.
She is already 16years old. But she _______as if she were still a little girl.