Two friends were talking about education, _______, about the kind of education that they received in their youth.
He has some trouble ______ his classmates, but he has no trouble ______ doing his lessons.
I bargained with the shopkeeper for a long time, and finally we agreed________the price.
________the rapid growth of short messages which are sent by mobile phones, the number of criminal cases through short messages are increasing.
— Have you read the book War and Peace________Tolstoy?— No. I’ve never heard of it.
The study you have been making________the ancient Chinese culture is an interesting job.