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Choose the correct option to complete the gap.

______ you go hiking when you visited Cotopaxi National Park?

A. did

B. do

C. were

We use it to express a recommendation.

A. Can, could

B. May, might

C. Must, have to

D. Should, ought to

A rule that describes, but does not explain, a pattern in nature and predicts what will happen under specific conditions.

A. rarefaction

B. scientific law

C. observation

D. experiment

E. theory

William drew pictures when he was young

A. Present Simple

B. Past simple

C. present continuous

D. future simple