Mr. Wang told us that he would devote all the time he could spend _______ his oral English before going abroad.

Camels have three eyelids to ________ themselves from the blowing sand.

--- Who _______________ the question? --- The girl who was standing beside me. We were ____________ in the question.

Tom was over there. His red clothes stood out clearly ________ the snow.

Although we haven’t got the accurate statistics, it is estimated that ______ 300 factories in this province closed down during the economic crisis.