We should ________ ‘Thank you’ when we borrow something from someone.
She seldom speaks English after class, for she was afraid __ mistakes __ grammar.
Many students study English by aloud in the mornig.
Old people and children must _______ in our country .
They are ____ tired ____on.
The number of the students in our school___1,600 and a number of them___ from Canada.