The world today _____ different without the amazing discoveries produced by great scientists.
A. were B. had been
C. would be D. would have been
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
