The old rules have to be ______ because they only applied to the circumstances that existed when they were made a hundred years ago.

The young girl stood there ______ without sayinganything.

Willyou be back _____ five in the afternoon — I am not sure, maybe later thanthat.

How long can I ________ thebook—For two weeks.

Tom ______________ sending e-mails _____________letters．because it is faster.