一Did he notice you enter the classroom? 、
一I don’t think so．He _______ to the radio with his eyes shut·
| A．1istened | B．was listening | C．has listened | D．had listened |
Some experts warn that global wanning will______more than one million sorts of plants.
| A．turn dnwn | B．bring in | C．wipe out | D．take away |
The company had to______a number of workers because of the drop in sales.
| A．see off | B．take off | C．cut off | D．lay off |
Billy was the youngest boy on the hike, but he______with the others.
| A．kept up | B．turned up | C．caught up | D．drew up |
You’d better wash the shirt in cold water, or the color will______.
| A．lose | B．go | C．run | D．drop |
We have to______the costs of the new system against the benefits it will bring.
| A．compare | B．weigh | C．judge | D．consider |