By nine o’clock all the Olympic Torch bearers had reached the top of Mount Qomolangma, ______.
| A．above which appeared rare rainbow soon. |
| B．rare rainbow appeared soon above which |
| C．above which rare rainbow appeared soon |
| D．above which did rainbow appear soon |
Ten years ________a long time in one’s life.
| A．has been | B．are | C．is | D．have been |
— It’s the office! So you know eating is not allowed here.
— Oh, sorry.
| A．must | B．will | C．may | D．need |
It is known to all that ____ computer was invented in the USA.
A. that B. / C. the D. one
You will be late _____ you leave immediately.
| A．unless | B．when | C．while | D．as |
Don’t leave your keys in the car. Someone might steal ________ .
| A．one | B．that | C．this | D．it |