We should tell hunters ________________tigers.
—Do you know about Yuan Longping?—Only a little. But Chinese people are proud of the man ______ hybrid riceis famous.
Two years _____ since I came here.
He became a famous writer when he was ______ .
Fei Junlong and Nie Haisheng are the ______ of our nation.
—Do you know _____? —Sorry, I don’t know.