--- Tom, don’t play any tricks on me. I don’t like them.
--- _____________.
| A．That’s OK. | B．Why not? |
| C．Sorry, I won’t. | D．You are welcome. |
I to Shanghai three times.
| A．have gone | B．have been | C．went | D．was |
— I’m leaving for Qingdao tomorrow.
—
| A．Congratulations! | B．I’m sorry to hear that. |
| C．You’re welcome! | D．Have a good trip! |
It’s said that the forest disappearing.
| A．is | B．am | C．are | D．was |
—Why are you so happy, today?
—Because I to London with my parents tomorrow.
| A．fly | B．flew | C．am flying | D．have flown |
The computer in 1946 in America.
| A．is invented | B．was invented | C．invents | D．invented |