It is usually warm in my hometown in March, but it ______ be rather cold sometimes.

‘s road traffic map is like a cobweb of small streets, offering drivers more _______ when one road is blocked.

Bill Grates is one of ______ people in the world.

Are you happy with your new computer? — No, it is _____ me a lot of trouble. [ ]

The doctor must be _______ 24 hours a day, 7 days a week in the boarding school