You are a ______ man now; you are no longer a boy.
| A．amateur | B．mature | C．casual | D．visual |
Water can absorb and give off a lot of heat without big changes in temperature,thus creating a___environment.
| A．peaceful | B．sensitive |
| C．common | D．stable |
If we can___our present difficulties,then everything should be all right.
| A．come across | B．get over |
| C．come over | D．get off |
People try to avoid public transportation delays by using their own cars,and this___creates further problems.
| A．in short | B．in case |
| C．in doubt | D．in turn |
She devoted herself___to her research and it earned her a good reputation in her field.
| A．strongly | B．extremely |
| C．entirely | D．freely |
If the firms failed to make enough money,they would______.
| A．close down | B．call off |
| C．turn down | D．set off |