-----Our women athletes achieved great success in the Vancouver Winter Olympic Games.----- Yes. No one could perform _____, I think.

Make sure to turn off the gas after you take a bath, which would ___ cause danger.

 It sounded like something was wrong with the car’s engine then, ______ they would have carried on their journey.

New digital mobile phones definitely produce less radiation, but that doesn’t ______ mean that they should be used without caution. 

John was one of the top students in our class, but believe it or not, he_______ passed the English exam last term.(西安市)