—Will you give me a hand? I have some trouble_______ the scientific problem.—Don't worry. I'll try my best to help you _______.
--- _____ is your mother? --- She is 30.
I have a good friend. _____ name is Jim.
— I’m sorry I’m late. — ________.
I think the Beijing Olympic will develop our ________with many countries.
I fell in the street and _______ my leg. A beat B.hid C hurt D ached