It takes us about ____ hour to get to the Yangzhou-Taizhou Airport from Taizhou by ____ bus.

______hashetaughtEnglishinthisschool?—Fortwoyears.[ ]

People who have regular physical exercise seldom catch a disease like H1N1 Flu, ______?

She kept _________ hard at her physics and finally caught up with us.

I was really too busy with my homework and I couldn’t help ____________ housework.