From the ___ expression on her face, we knew that the problem was ____.
| A．puzzling….puzzling | B．puzzled…puzzled | C．puzzling..puzzled | D．puzzled..puzzling |
Try not to cough more than you can________since it may cause problems to your lungs.
| A．check | B．allow | C．stop | D．help |
Time is of no importance to great thoughts，________ are as fresh today as when they first passed through thinkers' minds ages ago.
| A．what | B．that | C．which | D．where |
Now there is just one point ________ I wish you to make quite clear.
| A．where | B．which | C．whether | D．when |
It's helpful to put children in a situation ________ they can see themselves differently.
| A．that | B．when | C．which | D．where |
—What do you think of teaching，Bob?
—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
| A．where | B．which | C．when | D．that |