Question

3. The water level dips
the streams
the winter season.
4. Who were interested in a discovery of penicillin in the beginning​

Answer 1

Explanation:

3.The correct use of the preposition in the above sentence is "in". A preposition is a word that is used to connect pronouns, nouns, and verbs in Eglish grammar sentences. "In" is used to indicate a location or level of something.

4.It was not until 1940, just as he was contemplating retirement, that two scientists, Howard Florey and Ernst Chain, became interested in penicillin.

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