— But for the bird flu ( 禽流感 ) in Vietnam in the summer of 2004,I ______ you to go to Vietnam for sightseeing. — Really? What a pity!
The scientists have made an exhaustive study of the virus _______ many people have been inflected.
When I was in Spain last summer, I ______ quite a lot of Spanish.
It comes as no surprise that many parents walk along their young children ____ their safety.
Within a few years China ____ well have the most advanced railway industry in the world.
It’s reported that global warming is heating the planet twice as quickly as _____ feared.