–What do you think of________nature reserve you visited last weekend?-It’s great. It is ________ideal home for wildlife.
I was doing my homework _______ a dog came in.
—Marycan’thelp___thehouse.Why?—Becausesheisbusy____ahotelreservation.
It is about _______by bus from here to Harbin.
It’s impossible for us ____ there on foot in two hours.
—Will you go to Hangzhou by _____ car? —No, I'll take _____ train.