29．Mr. Bush is on time for everything．How it be that he was late for the opening
ceremony?
| A．could | B．should | C．may | D．Must |
___________ she was chosen made us very happy.
| A．What | B．That | C．Why | D．How |
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 |