I know _______ of the twins have been to Hainan Island before.
—Can you work put the physics problem?—Sorry, I can _________ understand its meaning.
—Remember to close the door when you leave.
—Why not join us in the game,Kitty?—_________, but I have to do my homework first.
—Could you tell me_________?—By underground.
Jin Yong is one of the greatest and oldest _________ writers. He is still_________.