12. Nam is not very good _____________ English.

A. in                        B. at                        C. with                        D. to

13. Alexander Fleming, _____________ discovered penicillin, received the Nobel Prize in 1945.

A. that                        B. which                C. who                        D. whom

14. You need good shoes to go biking in the mountains _____________ the ground is rough and hard.

A. even though        B. before                C. so that                D. because

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