—There's someone knocking on the door．Who it be?
—It must be Mary．She promised to be here at 8：00．
| A．must | B．can | C．shall | D．need |
—When choosing furniture, you only focus on function while I think more about the design.
—That's ________ we differ.
| A．how | B．what |
| C．which | D．where |
—How do you like the book?
—It's quite different from ________ I read last month.
| A．that | B．the one what |
| C．the one | D．which |
________ Sandy's damage is unlikely to last long, it would apparently hurt the total economic output of the fourth quarter.
| A．Since | B．Before |
| C．Unless | D．Although |
The progress of the work will depend on what the weather conditions are and ________ modern the equipment is.
| A．how | B．whether |
| C．what | D．which |
(2013·银川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.
| A．whether | B．how |
| C．where | D．when |