While _________, people sometimes can’t help buying something they don’t really need.
________ recent report says that all ________ sea water will have been polluted by 2040.
Mary's pale face is a _____ that she _____ rather weak after the operation.
It was _____ that I found my diamond necklace.
–I've passed the driving test! –I'm glad to hear that you _____ it at last!
Why didn't you make me a telephone call yesterday? I _____ about it.