1. Neil Armstrong, ________ walked on the moon, lived in the USA.
A. which B. whom C. who D. whose
2. Marie Curie, ________ is one of the greatest women in our time, discovered radium.
A. whom B. whose C. which D. who
3. I’ll bring some rain coasts just in case. I hope my friend________ laugh at me.
A. didn’t B. won’t C. don’t D. haven’t
4. The________ can know when a volcano will erupt nowadays.
A. science B. siencetist C. siencetists D. siencetifically
5. We think that Mother’s Day should be celebrated________.
A. nationalhood B. nation wide C. nationality D. nation
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