Someone is ringing the doorbell. Go and see ______.
It should not be a question of humans_________ and nature ____________.
The couple decided to ____________ a child because they couldn’t have babies.
He is the first_________hardships, the last__________comforts.
—Do you mind my taking this seat?—_______________.
The speech delivered by the mayor of Shanghai on the opening ceremony of the World’s Swimming championship left me a deep ___________.