No one knows for certain how the first Americans arrived in _____ is now the United States.
A. which B. what C. where D. why
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
