A.sum B.amount C.number
单项选择题The Europeans ()to stay ahead in aeroplane design.
A.failed B.missed C.lost
单项选择题Mary () into the room.
A.burst B.crashed C.hit
单项选择题The war () in 1937.
A.broke up B.broke off C.broke out
单项选择题She was sleeping with () windows.
A.empty B.open C.wide
单项选择题Mary likes living ().
A.lonely B.alone C.in person