—Were you at home at 9:00 last night? I called you but nobody answered. —Sorry, I ________ at that time.
Look! The students _____ the classroom.
—May I use your bike? —_____
—I’m going to Kunming for my holiday this month. —_____
—_____ do you usually go to school? —By bus.
-- Excuse me, where is the post office? --Go across the bridge, it’s on your left.