The couple walked together as far as the second crossing of the street they waved goodbye to each other.
| A．when | B．which |
| C．why | D．where |
John received an invitation to a dinner, and with his work____, he gladly accepted it.
| A．finished | B．finishing | C．to finish | D．was finished |
______ students should be given more free time is suggested by many experts and welcomed by kids in school．
| A．What | B．Why | C．Whether | D．That |
Only when he returned______ the truth.
| A．he found out | B．did he find out | C．he finds out | D．does he find out |
Some insects ______ the color of their surroundings to protect themselves.
| A．take in | B．take off | C．take on | D．take out |
It was such a_____ job that I really felt_____.
| A．tiring; tiring | B．tired; tired | C．tiring; tired, | D．tired; tiring |