I saw Bob play the piano at John's party and on that ________ he was simply brilliant.
| A．scene | B．circumstance |
| C．occasion | D．situation |
Don’t be too ______ about things you’re not supposed to know.
| A．strange | B．amusing | C．curious | D．conscious |
People have always been curious ______ how living things on the earth exactly began.
| A．in | B．at | C．of | D．about |
The father as well as the three children ______ every Sunday afternoon in winter.
| A．is going | B．go | C．goes | D．are going |
—Did Alan enjoy seeing his old friends yesterday?
—Yes, he did. He ______ his old friends for a long time.
| A．didn't see | B．wouldn't see | C．hasn't seen | D．hadn't seen |
．The moment I got home, I found I _______ my jacket on the playground.
| A．had left | B．left | C．have left | D．was leaving |