He smiled politely ______ Mary apologized for her drunken friends.
| A．as | B．if | C．unless | D．though |
A journal is not necessarily a reliable record of facts, for the writer’s impressions _____ colour the telling of events.
| A．must | B．shall | C．should | D． might |
She seated herself at a small table in the restaurant, waiting _____.
| A．serving | B．to serve |
| C．served | D．to be served |
Most online classes let students learn _____ their own pace.
| A．at | B．to | C．from | D．by |
_____the size of the universe, some researchers believe that there is life beyond our planet.
| A．Consider | B．To consider |
| C．Considered | D．Considering |
The trains leave every 15 minutes; if you miss ____ , you don’t have to wait long for another.
| A．it | B．this | C．one | D．some |