However, at times this balance in nature is ______, resulting in a number of unforeseen effects.

I’m expecting a digital camera for long, but dad has no time to buy ______ for me.

You can’t predict everything．Often things don’t asyou expect．

You trustan online shop just because it has a beautifully-designed website.

didn’t expect that John would be absent from my last Sunday’s birthday party.— As far as I know, he ______ to see his parents in the countryside on Sundays.