After retirement, Mr. Smith ______ painting, which he had always loved but had not had time for.
It was ___she was about to go out ___the telephone rang.
---Who is making so much noise in the garden? --- ___ the children.
Were all three people in the car injured in the accident? No,___ only the two passengers who got hurt.
One day, _____,Newton saw an apple fall from a tree.
He made another wonderful discovery, _____ of great importance to science.