You’re our manager, so ______ or not you’ll attend today’s meeting is very important.
| A．/ | B． what | C．if | D．whether |
John said he had been working in the office for an hour, _______ was true.
| A．he | B．this |
| C．which | D．who |
The science of medicine _______ progress has been rapid lately is perhaps the most important of all the science.
| A．which |
| B．in which |
| C．that |
| D．with which |
Is this the reason _______ at the meeting for his carelessness in his work?
| A．he explained |
| B．what he explained |
| C．how he explained |
| D．why he explained |
This is Mr. White, _______ I think has something interesting to tell you.
| A．which | B．whom |
| C．that | D．who |
_______ has been announced, we shall have our final exams next month.
| A．That | B．As |
| C．It | D．What |