Most of us would rather send e-mail as it has _____ of the troubles of sending letters via the post office.
| A．nothing | B．none | C．some | D．either |
The water supply has been cut off temporarily because the workers the main pipe．
| A．repair | B．repaired |
| C．have repaired | D．are repairing |
As many as five courses are provided，and you are free to choosesuits you best．
| A．whatever | B．whichever |
| C．whenever | D．wherever |
Knowledge from real life isn't easier to forget thanachieved from textbooks.
| A．one | B．it |
| C．that | D．those |
By 16：30，was almost closing time, all the paintings had been sold out．
| A．which | B．when |
| C．what | D．that |
—I’m disappointed the experiment turned out to be complete failure again．
—Don’t lose heart．Try third time．
| A．the；a | B．a；the |
| C．a；a | D．不填；the |