______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
| A．To attach | B．Attach |
| C．Attached | D．Having attached |
—Jack, what do you think of the new work?
—It's not bad. But the hours are too long.
—Oh, _______
| A．that's really serious. | B．how about that job? |
| C．you'll soon get used to it. | D．you do it again. |
_______ the meeting room,he found all the parents already _______ there.
| A．To enter; sitting | B．Stepping into;to seat |
| C．Entered; seat | D．Entering;seated |
I _______ to help you but I was not able to spare any time.I _______ a paper last night and I'll have to finish it today.
| A．wanted; have been writing | B．have wanted;wrote |
| C．had wanted; wrote | D．had wanted;was writing |
He is _______ to get there in time if he starts right now.
| A．possible | B．probable | C．likely | D．impossible |
_______,but he still could not understand it.
| A．He had been told many times |
| B．Having been told many times |
| C．Told many times |
| D．Although he had been told many times |