Have you ever visited the Opera House? —Yes．When I was in Sydney, I ______ it twice

____________ the situation, Charles Yerkes undertook ____________ the system in 1902 by obtaining ownership of many different lines.

So far we have done a lot to build a lowcarbon economy, but it is _____idealWe have to work still harder.[ ]

I felt __________ last night and then I fell ____________ quickly.– I think you need more rest.

are not afraid ofsnakes, are you— No, certainly not Not rats, not flies,and ____ ants