— We should recycle everything we can．
— Absolutely．These may seem little things，but they’re not__________it comes to saving the
environment．
| A．since | B．when | C．while | D．as |
________ her faults, she’s Arnold’s mother. Don’t be so rude to her.
| A．whatever | B．What |
| C．Whichever | D．Whenever |
Mary clapped her hand over her mouth _______ she realized what she had said.
| A．while | B．as soon as |
| C．suddenly | D．then |
_____ she goes, there are crowds of people waiting to see her.
| A．Wherever | B．however |
| C．Whichever | D．Whoever |
You should put on the notices ______ all the people may see them.
| A．where | B．in which |
| C．at | D．for them |
_____ I suggest, he always disagrees.
| A．however | B．whatever |
| C．Whichever | D．Whoever |