Rubbish _______ to produce electricity after this kind of new machine is invited. [ ]

______ is even more important is that the earth cooled down, water began to appear on its surface

I’d like to visit Kate tomorrow. Do you know______ —- Sorry, I don’t know her address, either.

Can I ______ your bike, Sam—Sorry, I ______ it to Mike just now.

Most products, ____ which this is one example, sell well, _______