The program is like a window on the world ____ you sit by it and fix your attention on what it shows.
| A．if | B．as | C．while | D．unless |
John worked hard at his lessons and gained ________to a famous university last year.
| A．permission | B．admission | C．agreement | D．freedom |
There are 40 students in our class，who come from a ________of backgrounds.
| A．variety | B．mixture | C．extension | D．combination |
—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 |