There was still a lot of unknown information prior to our first flight into space. People were unsure about what would happen to a human in space. A. worried B. uncertain C. anxious D. doub

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There was still a lot of unknown information prior to our first flight into space. People were unsure about what would happen to a human in space.

worried

uncertain

anxious

doubtful

Giải thích

worried (adj): lo lắng, bồn chồn

uncertain (adj): không chắc chắn, không biết rõ ràng

anxious (adj): áy náy, lo âu, lo lắng

doubtful (adj): nghi ngờ, ngờ vực, nghi hoặc

Từ được gạch chân: unknown (adj): không biết, vô danh

® unknown = uncertain → chọn B