It's quite obvious that the aging population in China will cause heavy pressure on ________ whole society in the future．
A．／；the B．the；／ C．a；the D．a：a
They are forbidden _____, for they are still middle school students.
A. to smoking B. to smoke C. smoked D. smoke
We have the most population in the world, most of it _____ farmers.
A. to be B. is C. are D. being
_____ at the back of the theatre, the girl couldn’t see ZhouJielun clearly.
A. Seating B. Sited C. Seated D. Seats
The direction_____ which the president would go was kept a secret_____ safety concern.
A. for, over B. from, about C. in, for D. at, as
It rained heavily in the south, _____ serious flooding in several provinces.
A. caused B. having caused C. causing D. to cause.
