The Smiths are praised _______ the way they bring up their children.
| A．from | B．by | C．at | D．for |
We can never expect bluer sky unless we create less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |
This area experienced. heaviest rainfall in month of May.
A. 不填; A. B. a; theC. the; theD. the; a
When his brother was to cross the street, he was knocked down by a truck and badly ____.
| A．injured | B．damaged | C．harmed | D．destroyed |
Recently, these companies have _____ some workers because of the drop in economy.
| A．hired | B．dismissed | C．refused | D．employed |