Tom, your father is waiting ________ you at the school gate.
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
When the sun ___ in the east, the little hero tried hard ___ the red flag to the top of the pole.
—_______ do you like _______ the picture on the wall?—The colour.
—My daughter has passed the exam. —Congratulations! She’s really excellent.— ____________.
—We must act now because time is _______.—Yes. Let’s start.