21. For more information, please send an e-mail, ______ you can also include your advice to us.
| A．when | B．where | C．which | D．that |
When asked why he went there, he said he was sent there ________ for a space flight.
| A．being trained | B．training | C．to have trained | D．to be trained |
My mom’s __________ determined me to go on with my study.
| A．encourages | B．encouragement | C．encouraged | D．encourage |
These robbers are sure __________.
| A．to punish | B．to be punishing | C．being punished | D．to be punished |
My father is sleeping soundly, so I tried my best ____________ any noise.
A. not make B. not to make C. to make not C. to make
I don’t think it wise ________ the hard work that they have refused to do.
| A．of you taking on | B．for you to take on | C．of you to take on | D．for you taking on |