With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.
| A．whether | B．what | C．that | D．how |
相关试题
The pilot asked all the passengers on board to remain _________ as the plane was making a landing. 
| A．seat | B．seating | C．seated | D．to be seating |
I try to make him understand that I am not interested in him, but he never gets the ______.
| A．message | B．news | C．information | D．word |
Broadly speaking, I would agree with Shirley, though not ____________.
| A．widely | B．entirely | C．extremely | D．eventually |
I would appreciate ________ if you could teach me how to use the computer.
| A．that | B．this | C．it | D．you |
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