31. How to solve the problem __________ in the meeting right now
| A．was being discussed | B．are being discussed |
| C．is being discussed | D．is going to discuss |
Owen wouldn’t eat anything ____________ he cooked it himself
| A．until | B．since | C．unless | D．while |
— I wonder ________ you’ll water this kind of flower. 
——Every other day.
| A．how often | B．how long | C．how soon | D．how much |
________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |
As a new diplomat, he often thinks of_____- he can react more appropriately on such occasions.
| A．what | B．which | C．that | D．how |
—Would you please help me with the box? 
—_________
| A．Yes, please | B．No, please don’t | C．With pleasure | D．My pleasure |