______ this afternoon, you would have to come again next week．
| A．The boss didn’t return | B．The boss were not to return |
| C．Were the boss not to return | D．Didn’t the boss return |
Everything was perfect for the picnic ______ the weather.
| A．in place of | B．as well as | C．except for | D．in case of |
Don’t promise anything ______ you are one hundred percent sure.
| A．whether | B．after | C．how | D．unless |
We’ll have a picnic in the park this Sunday _________ it rains or it’s very cold.
| A．since | B．if | C．unless | D．until |
There were some chairs left over _____ everyone had sat down.
| A．when | B．until | C．that | D．where |
For many cities in the world, there is no room to spread out further, _______ New York is an example.
| A．for which | B．in which | C．of which | D．from which |