He was busy writing a story, only once in a while to smoke a cigarette.
| A．to stop | B．stopping | C．to have stopped | D．having stopped |
If we________now to protect the environment，we’ll live to regret it.
| A．hadn’t acted | B．haven’t acted |
| C．don’t act | D．won’t act |
When I first met Bryan I didn’t like him，but I________my mind.
| A．have changed | B．change |
| C．had changed | D．would change |
It remains to be seen________the newly formed committee’s policy can be put into practice.
| A．that | B．which |
| C．what | D．whether |
________one of you breaks the window will have to pay for it.
| A．Whoever | B．Whatever |
| C．Whichever | D．Wherever |
________you said at the meeting describes a bright future for the company.
| A．When | B．How |
| C．What | D．That |