______ takes a lot of concentration and a great sense of balance to stay on it.
Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company .
______ me the truth, or I’m not going to leave the room.
It is said that the weather will ______ hot for another three or four days.
—Who called just now, Sam?—It’s Terry. She asked _____.
The shoes are _____ than I expected.