If nature does not provide man with the necessary material, it is the laboratory _____ he will turn to for it.[ ]

Where did you go ________ last week—I went to ________ Sydney.

I am tired after the long work. I want to have a ____ ___.

I really hope we can see Zhou Xun in Hangzhou this time. —Maybe, if we are______.

I hope that the little ________ I have beenable to do does good to them all.