—Are train services now back to ______after last week's snowstorm?—Yes,they are.
The meeting ________ a few weeks after he had arrived in America.
________ is no possibility ________Bob can win first prize in the contest.
I have no idea ________ he will come back.
The rescue team made every ________ to find the missing mountain climber.
We are faced with a problem ________ we don’t have enough natural resources.