——Mom,what did your doctor say?—— He advised me to live _____ the air is fresher.in where B. in which C. the place where D. where
—I am going to travel to America.Would you consider telling me about your experiences there? —__.Let's discuss it over dinner.
I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.
---I’m sorry! I would have taken him to hospital if I had known he was seriously ill. --- But ______ .
Rock-climbing is a breathtaking activity, very popular nationwide among young people, ______ cooperation as well as courage plays an important role.
A housing bubble is an economic situation _____ occurs when house prices rise much too fast.