— Come and join us, Betty!— I’m afraid I can’t. I’m too busy now. If I ______ time, I would certainly go.
There are seven_______people in Hongkong. A. million B. million of C millions D millions of
_______is the population____the USA?
In autumn it will______cool.
My mother goes shopping,______I must look after my little brother.
He will leave school______two days.