The computer system __________ suddenly while he was searching for information on the Internet.
#13080
A
broke down
B
broke out
C
broke up
D
broke in
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After 1953 _______ people have succeeded in climbing the mountain.
#14312
A
several hundred of
B
several hundreds
C
several hundreds of
D
several hundred
Tom began to learn Russian by himself in _____.
#14486
A
the fifty
B
the fifties
C
his fifties
D
his fifty