This is a useful lesson, ______________ it is difficult to ...

★ Conjunctions, Interjections and Determiners

This is a useful lesson, ______________ it is difficult to remember.

A. but

B. so

C. nor

D. or

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Find the interjection in the following sentence.

Wow! I had no idea so many common expressions were originally written by Shakespeare.

A. originally

B. common

C. wow

D. no idea