He is a ________ man—he always says what he thinks.
| A．curious | B．serious | C．sincere | D．upset |
—Hi，Peter. Long time no see.
—Oh，it’s you，Jack. I’m sorry I didn’t ________ you at first.
| A．know | B．recognize | C．remember | D．realize |
People are encouraged to speak openly，but careless words are ________to hurt others’ feelings.
| A．possible | B．probable | C．likely | D．sure |
Our bodies are strengthened by taking exercise. ________，our minds are developed by learning.
| A．Probably | B．Likely | C．Similarly | D．Generally |
Smoking is one of the ________causes of cancer，killing millions of people each year.
| A．major | B．similar | C．commercial | D．chemical |
In a sports team each player has a clear role，and there are few occasions ________members are confused or uncertain about their roles.
| A．whose | B．that | C．when | D．which |