Are they getting ready _____ the exam?
The math question is difficult for the students work out.
Some terrorists the music hall in Paris and killed over 100 people on Nov. 13.
People write letters to friends and relatives, but now WeChat and QQ communicating with others widely.
The weather in Kunming is too cold too hot. People like to live there.
--- On Black Friday, the prices of the products are much than usual. --- Really? So it’s a good chance for me ________the things I need.