Our manager has gone to Paris, so I have to deal with all the letters during his ________.
Many things ______ impossible in the past are very common today.
She is believed______ the train, otherwise she would have arrived here by now.
Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.
The victims of the accident demanded that the case ______ at once.
We each took ______ tea after having ______ wonderful supper at my aunt’s yesterday.