With the send-up of the spaceship approaching, occasions are rare _________ the staff can spend a weekend with their families.
| A．when | B．where |
| C．which | D．that |
Even given________ fuel, the current rate of increase of energy consumption cannot continue for much longer.
| A．adequate | B．accurate |
| C．absent | D．confident |
—What clothes should we wear to attend the ball?
—Dress ________ you like.
| A．however | B．what |
| C．whatever | D．how |
With all factors ________, we think this program may be better than all the others in achieving the goal.
| A．being considered | B．considering |
| C．are considered | D．considered |
My interest in stamp–collecting ________ my school days.
| A．dated from | B．dates back to |
| C．has dated to | D．has dated back to |