— Is your father a doctor in No.2 Hospital?—No, he ___________ a farmer and now he is a driver.
—He has never been to Beijing. —
I couldn’t wait _____ the box as soon as I received the gift.
_____ of the students in our class _____ girls.
Don’t _____ your hands from the window when you are on a bus.
Maria has _____ trouble _____ math, so she often asks her math teacher for help.