In winter, it is dangerous to go to school with snow ______the ground.
Mr Smith sold that magnificent cottage of his on the sea ________ 2,000,000 dollars.
________ the rapid growth of short messages sent by mobile phones, the increasing number of criminal cases appeared through short messages.
—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 characters is an instructive job.
Areas where students have particular difficulty have been treated ________ particular care.