--- Why did you buy two pairs of shoes?--- It was so hard to choose which was________, so I took them both.
Mr Yao impressed the students his creative ideas and humorous words.
It is time ____ to school.
—How old ____Li Ping and Lucy ? — Sixteen _____old.
—____ boys are there in your class ?—_____ 22 boys.
—How do you spell “pen”?—___________.