______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction.
A．Even if B．Since C．Despite D．Unless
He has been caught _________ the rain and is wet _________ the skin.
A．by; to B．in; to C．in; through D．with; in
It was Asimov was eleven years old his talent for writing became obvious.
A．that, when B．When, which C．when, when D．when, that
Is this the reason _____ at the meeting for his carelessness in his work?
A．he explained B．what he explained
C．how he explained D．why he explained
All these gifts must be mailed immediately__________ in time for Christmas.
A．in order to have received B．in order to receive
C．so as to be received D．so as to be receiving
The glass door have taken the place of the wooden ones at the entrance, _____ in the natural light during the day.
A．to let B．letting C．let D．having let
