At long last the child was found on top of _____ we call the museum of science and technology.
With the Internet widely used, a(an)___change has taken place in the way people communicate with one another.
When Mr. Smith took over the company, it was already heavily______ and had no money to pay the workers.
Children need a lot to grow up, but ________ they need love and care.
Our earth is getting warmer and warmer. It is time for us to_____ the emission(排放) of CO2.
We arranged to meet at 8:00 , but she never__________.