[ Vocabulary and Grammar ]
The scientist acted as an ________ during the experiment.
A. observation
B. observe
C. observer
D. observing

Random Topics:
Auxiliary VerbsFuture Continuous, Future Perfect and Future Perfect ContinuousGrammar - Present Perfect TenseJobsNouns, Articles, DeterminersState Verbs and Action VerbsGrammar and EssayAcademic VocabularyAdverbs and Adverbial PhrasesTenses and ConclusionsOther quiz:
General › ViewLet me ……….. myself
A. Introduce
B. Introduction
Tenses › View
The scientist ____ the data right now in the laboratory.
A. is analyzing
B. analyzed
C. analyzes
D. will analyze
Grammar - Be going to › ViewI _______________________________ to wash the car tomorrow morning.
A. will going
B. am going to
C. am going
D. will going to
Present Perfect and Past Simple › View
Past Simple refers to?
A. actions or events in the present
B. action or events in the past
C. action or events in the future
