18. The spy caught ______ the military base was sentenced to 20 years in prison and was limited ______ no relative visiting.
| A．to spy on; to | B．spying on; to | C．to spy on; with | D．spying on; with |
He commanded that all the gates ________．
| A．should shut | B．would be shut | C．shut | D．be shut |
As is known to us all, English books of this kind ________ well in middle schools.
| A．sell | B．sells | C．is sold | D．are sold |
_______ everyone here, I wish you a pleasant journey back to your country.
| A．By means of | B．On behalf of | C．In search of | D．For fear of |
I think you need some outdoor exercise. Plenty of fresh air will ________good health.
| A．contribute to | B．devote to | C．apply to | D．adjust to |
We will be free tomorrow，so I suggest ________to the history museum.
| A．to visit | B．visiting |
| C．we should visit | D．a visit |