他们正忙着为考试做准备.They are busy ______ ______ the test.

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他们正忙着为考试做准备.They are busy ______ ______ the test.

他们正忙着为考试做准备.They are busy ______ ______ the test.
他们正忙着为考试做准备.
They are busy ______ ______ the test.

他们正忙着为考试做准备.They are busy ______ ______ the test.
They are busy __preparing____ _for_____ the test.