—Have you been to the Great Wall?
—Perhaps not in my memory.________，it might have been during my early childhood.

—Mum，I am afraid I won’t do well in the coming test.
—Honey，________more careful，________you will make it.

No, I’m too busy right now. Please give me an hour, _____?

________a certain doubt among the people as to the practical value of the project.

You and I could hardly work together, ______?

--- I hear that Jane has achieved great success.
--- ________ and __________.

---Do you have any idea what Hawk does all day?
--- I know he spends at least as much time watching TV as he _______.

______it is to jump into a pool or go swimming in the sea when you visit Hawaii!

Small _____ it is, the pen is a most useful tool.

“Only two centimeters higher, _______break the world record,” encouraged the coach.