Children are usually mean. _____ they take much, they won’t give.
| A．Even so |
| B．Even if |
| C．Since |
| D．But |
I sincerely request the honor of your _______ at my son’s birthday party to be held next Sunday.
| A．admission | B．entrance | C．permission | D．presence |
The roof fell ______ the PLA men had time to rescue the child trapped in the house.
| A．until | B．unless | C．before | D．because |
When he ______ the front door, he found his keys were nowhere.
| A．would open | B．opened | C．had opened | D．was to open |
The university with two____ campuses has a student population of 50,000 in total．
| A．unique | B．separate | C．single | D．alternative |
Faced with_______ failure, it is the most important for us to keep up ______good state of mind.
| A． / ; a | B． a ; / | C． the ; / | D．/ ; the |