He kept writing the book _____ he was in great pain.
--Excuse me, teacher, can I ask you something about the last class? I didn’t quite understand it.--Sure! Please feel _________to ask me anything!
--Excuse me, can I have this seat, please?--I’m sorry, but it’s_______.
—You see, China is becoming stronger and stronger now.—Yes. That’s why Chinese _____ in more and more schools out of our country.
The two brothers didn’t quite get along well _______the past, but now they are like peas and carrots.
If you have________question, you may email me at jessen@hotmail.com.