. He _____ his potential had it not been for his desire to meet new challenges.
| A．would never have realized | B．would never realize |
| C．never realized | D．had never realized |
Lots of problems _______ from the newly –built apartment .
| A．rise | B．raise | C．lift | D．arise |
–It’ll take me at least 2 hours to do this!
–Oh, ______! I could do it in 30 minutes.
| A．come on | B．pardon me |
C．you are right | D．don’t mention it |
____the sound of the gun,many people came out, ____to see what was the matter.
| A．Heard,running | B．Heard,run | C．Hearing,run | D．Hearing,running |
John received an invitation to dinner,and with his work___,he gladly accepted it.
| A．finished | B．finishing | C．having finished | D．was finished |
It is no _____arguing with Bill because he will never change his mind.
| A．use | B．help | C．time | D．way |