Evidence obtained from observation and experiment is often used to _____ a scientific theory.
| A．confirm | B．confine | C．conform | D．conceive |
It is pretty well understood_______ controls the flow of carbon dioxide in and out the atmosphere today.
| A．what | B．when | C．that | D．how |
— Let’s go to a movie after work, OK?
— _____________
| A．Not at all. | B．Why not? |
| C．Never mind. | D．What of it? |
He is said to be very rich, but I don’t understand why he is always _______.
| A．in uniform | B．in fashion |
| C．in trouble | D．in rags |
I thought I was going to fail the exam, but I passed _______.
| A．above all | B．after all |
| C．in all | D．first of all |
I am sure that _______ you said is wrong.
| A．which | B．what | C．this | D．how |