I always tell my students _______ on the road because it’s really dangerous.

We have a Computer lesson _______ every Friday.

Is that the reason __________ you are in favor of Obama for the second round?

Don’t touch the machine_________ the teacher allows you to.

ve it or not,last month in America I came across the girl whose photo was in the driftbottle I got three years ago—ReallyThat’s the most surprising _______ I’ve ever heard of！