A Du’s unique voice ________ especially to young people.
These natural parks are very important for preserving many animals, which would _______ run the risk of becoming extinct.
— Does Jim do his new job well? — __________ his old job. — How stupid! I fear there's no hope for him.
People are always on the go , so they spend their weekend on housework .
On the third floor there are two rooms, _____ is used as a meeting-room.
—Are you satisfied with her work, sir?—Not at all. It couldn’t be any _______.