I really don’t know ________ I put my wallet after I paid the bill.
| A．where was it | B．it was where that |
| C．where it was that | D．where was it that |
We will be given a（n）__________ to ask questions at the end of the lecture.
| A．presentation | B．explanation |
| C．opportunity | D．possibility |
Every time she tried to argue with her husband, she __________ crying her eyes out.
| A．picked up | B．stayed up |
| C．ended up | D．kept up |
While studying, fix your mind on what is really important, or you will __________ remembering nothing.
| A．take up | B．lead to |
| C．stick to | D．end up |
Though __________ to see us, the professor gave us a warm welcome.
| A．surprising | B．surprised |
| C．to surprise | D．being surprised |
The students，__________ at the way the questions were put, didn't know the answers to them.
| A．they being surprised | B．surprised |
| C．their being surprised | D．them surprised |