No government can justly claim authority ______ it is based on the will of the people．
| A．unless | B．after | C．so that | D．while |
It seems ________ our team is going to win.
| A．even though | B．when | C．if | D．as if |
—How many practical plans has your deskmate made this week?
—. All have turned out disappointing.
| A．None | B．Nothing | C．Nobody | D．No |
The best times to visit Shangri-la are spring and autumn ____ the temperature is at its mildest.
| A．when | B．where | C．that | D．which |
Scientists study ____ human brains work to make computers.
| A．when | B．how | C．that | D．whether |
______ in the school campus in spring, we will always noitce a colorful display of flowers.
| A．Walk | B．Having walked | C．Being walking | D．Walking |