--Mom, these are my friend Peter and __ brother Bill.--Welcome to our home. Come in, please.
----How do you like the two pairs of shorts? ----They don’t fit me well. They are _______ too long _______ too short.
________ my surprise, the twins have nothing _______ common.
---Do you know sound travels very fast? ----Yes. But light travels _______ sound.
Paper-making is one of _______ of ancient China.
Could you please give some _______ to the _______ teachers?