---I hear there will be ______ talk on English study tomorrow morning.---Do you mean ______ speech our teacher asked us to listen to?
____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.
— What made your skin look so terrible? — _______ to the sunlight for a long time.
Only after a baby seal is pushed into the sea by its mother _____ to swim.
As is well known, carelessness and irresponsibility _______ many deadly accidents.
They ___________ for two hours