center
| A．ocean | B．decide | C．cause | D．socialist |
To make members of a team perform better, the trainer first of all has to know their ___and weaknesses.
| A．strengths | B．benefits | C．techniques | D．values |
He just stared at me and there was an expression in his eyes that I couldn’t．
| A．tell | B．watch | C．read | D．feel |
When I got off the crowded bus, I found my pocket _____ and the disk in it with the important documents gone.
| A．picked | B．stolen | C．missing | D．lost |
We can never expect ____ bluer sky unless we create _____ less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
The newly discovered star was named ___a Chinese astronomer ____ honor of his contributions to astronomy.
| A．for; in | B．after; for | C．as; in | D．after; in |