Without facts, we can't form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.
| A．which to be based on | B．upon which to base |
| C．which to base upon | D．to which to be based |
To qualify yourself for this kind of new job, I recommend that you ________ some online courses.
| A．to take | B．taking | C．take | D．would take |
I soon found that the work I was doing had already been done by someone else —________ I was wasting time.
| A．as a result | B．in the meantime |
| C．in other words | D．for one thing |
The doctor has worked with patients of this kind for eight years, so he knows what ________ in his job.
| A．expected | B．to be expecting | C．expects | D．to expect |
—Who telephoned you just now?
— don’t know. I was about to answer the phone when it ________.
| A．rang up | B．rang off | C．hung on | D．rang back |
He recommended a reporter to us who has ________ outstanding talent for writing and is known for his sympathy for ________ poor.
| A．an; the | B．an; 不填 | C．不填；不填 | D．the；the |