10. - Can you show me your headmaster's office? -_____But I don't know if he is in at the moment.A. Go ahead B. You're welcome c. Of course not D. Sure
I’m very happy _________ a chance to visit your country.
Zhongguancun made __________ for him to realize his dream.
__________ the plan many times, but he still didn’t understand.
When he got home, he found the door _____, the window ______, the money and the necklace in the drawer _____.
_______ of my classmates could work out the maths problem because it was too difficult.