單項選擇題

By using previous communication system, rescue is often a matter of chance. What does “a matter of chance” mean?（）

A.occasionally
B.accidentally
C.often
D.usually

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單項選擇題

We（）a sharp lookout while sailing in the iced waters.

A.keep
B.kept
C.are keeping
D.have kept

單項選擇題

When a mis-entry（）in the logbook, a red line would be drawn through that part.

A.has made
B.make
C.has been made
D.is making