—_________ do you have PE lessons?—Three times a week.
You’d better look up the new word in a dictionary____ you don’t know it.
Nobody ____ the answer now.
I have some problems with my English writing. Can you give me some_____?
— Whose pen is this? — Oh, it’s_____. I was looking for it everywhere.
The 18th National Congress of the CPC has been one of______things in our life recently.