_ they were quite tired, _ they continued working. A. Though, / B. Although, but C. Because, so
—Why do you like living in the countryside? —Because there’s ___noise and ___cars there.
—_______ will be not easy for people to work without computers.
_______ you do in the future, you should try your best to do it well.
There is _____ pollution in the world. We must stop it.
The population of Shanghai is larger than _____ of Shenyang.