Are you going to buy a camera? —–Yes. But there are so many kinds that I can’t decide __________ to buy.

I saw Helen at the party last month. It _________ a year since we met last time.

While the boy ______ down the street, the UFO _____ .

I’d like grapes and pears. —-Oh, I only need orange juice.

Last Sunday,when I got to the station,II had left my ticket at home.