Scientists are increasingly _____ that the earth is getting hotter because of carbon dioxide and other gases.
| A．convinced | B．confident | C．concerned | D．conscious |
It is ________ world of wonders, ________ world where we can find anything changed.
| A．the, a | B．/, / | C．a, a | D．a, the |
____ he has made up his mind to do something, nothing will stop him.
| A．Once | B．Before | C．Although | D．As if |
---- I drove to Zhuhai for the air show last week.
---- Is that the reason _______ you had a few days off?
| A．why | B．that | C．what | D．which |
Only by working hard your dream of becoming a doctor.
| A．you can achieve | B．can you achieve |
| C．can you be achieved | D．you can come true |
Although the working mother is very busy,she stilla lot of time to children.
| A．devotes | B．spends | C．offers | D．costs |