--____ did he send this letter to you? ---By mail
| A．Which | B．Why | C．What | D．How |
— How many people will attend the party?
—Ten, two children________.
A. includeB to include
C. including D. included
They considereda computer, which was considereda great help in their work．
| A．to buy; to be | B．buying; being |
| C．to buy; being | D．buying; to be |
is reported, Shenzhou VI has returned successfully.
| A．It | B．This | C．That | D．As |
The advanced worker, _________to devote himself to the factory, has succeeded in developing new techniques of production.
| A．determined | B．determining |
| C．having determined | D．to determine |
I can hardly imagine peter ____ across the Atlantic Ocean (大西洋)in five days.
| A．sail | B．to sail |
| C．sailing | D．to have sailed |