_______ of the students in our class _______ interested in micro blogs (微博) on the Internet.
____ was your last vacation? Exciting.
It’s too hot. We should ____ the windows ____.
Don’t get off the bus ____ it stops.
____is “Lucky 52” shown on CCTV-2? Every week.
— I wonder if I can learn English well. —________. All things are difficult before they are easy.