They are busy______ready for the exam.

They suspected that the secret had been________ by one of their colleagues．

— Why does the lake smell terrible?— Because large quantities of water _________.[ ]

is MrWhite, do you know—I don’t know exactlyBut I think he can be_______but a doctor

Collier once said, “A singleidea—the sudden flash of a thought — __________be worth a million dollars.”