This is the first time that I ___________ at the meeting

The English-Chinese dictionary ____my father bought for me many years ago is so useful.

Lily, why are you still here School is over for half an hour.—Because I ____________ my task yet. I still need one more hour.

What about __________ lecture yesterday—Well，__________ most boring one indeed.

We don’t have enough meat in the fridge.— I _______ some more in the supermarket soon.