There are nine books in the library.
| A．hundreds | B．hundred |
| C．hundred of | D．hundreds of |
There are seven_______people in Hongkong.
A. million B. million of C millions D millions of
_______is the population____the USA?
| A．What, of | B．What, in | C．How many, in | D．How many , of |
In autumn it will______cool.
| A．turn | B．get | C．look | D．take |
My mother goes shopping,______I must look after my little brother.
| A．so | B．because | C．and | D．but |
He will leave school______two days.
| A．with | B．after | C．in | D．on |