The inability to supply a cargo of the contractual quantity in the country of shipment（）the doctrine of frustration into operation.

The full utilization of berths can be achieved if（）.

A.ships arrive at random
B.cargo-handling time varies greatly
C.ships have to queue to get onto berths
D.ships do not have to wait to get onto berths

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The foreman says that the stevedores stopped working owing to the（）of the winch.

A.breakdown
B.breaked down
C.broken down
D.broke down

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