So difficult _______it to work out the problem that I decided to ask Tom for some advice.
| A．I did find | B．did I find | C．I’ve found | D．have I found |
—The plan _______for the trip is very important.
—I see, and he is sure to work it out on time.
| A．made | B．to be made | C．making | D．to make |
Can you explain ______ the OPEC can have such total control over the price of oil?
| A．how is it that | B．that how | C．how it is that | D．what is it |
—Do you know the mission of the volunteers?
—No. But I think _____ they will end up doing there will promote public awareness of environmental protection.
| A．that | B．no matter what | C．whatever | D．whether |
The entire hall burst into a great cheer and applause ______ the Nobel Prize winner appeared on the stage accompanied by the chairman.
| A．until | B．while | C．by the time | D．the moment |
— I see you got a “D” in biology. _______ ?
—Well. I found that subject hard. I think I’ll drop it for history.
| A．How about that | B．What for | C．How come | D．What’s your next plan |