The World Health Organization gave a warning to the public without any______when the virus of H1N1 hit Mexico in April, 2009.
Mr. Brook didn’t come back at the usual time last night. ______, he met some friends and stayed out until midnight.
The astronaut did many experiments in the spaceship, ______ much help for knowing space.
— What were you doing when I phoned you last night? — I ______ my homework and was starting to surf the Internet.
It may be fairly cheap to buy, but you’ve got to ______ the money you’ll spend on repairs.
The winter of 1990 was extremely bad. ______, most people say it was the worst winter of their lives.