If (如果) he isn’t at school. Please call me _______ 453-7868. [ ]

I’ve promised to help you and I’ll _____ my word.

We can go to Beijing Railway Station by bus. — Why not ______ there for a change? [ ]

Which of the two pairs of shoes will you take?—I’ll take ________. They are too small for me.

They have made so great progress .