Cycling is a very useful way, especially in cities _______ bike paths have been built.
--- Can I borrow this novel? ---Sorry. Only teachers and students in our school enjoy the ______.
I’m calling, ______my company, to thank you again for your generous help.
China might one day explore other planets, the ______designer of Chang’e-I told China Economic Weekly.
______to the world for help, Hollywood stars led a huge fundraising drive for Haiti.
Last night, an accident happened at ______crossroads a few meters away from ______school I attend.