The letters for the boss __________ on his desk but he didn't read them until three days later.
| A．were put | B．was put |
| C．put | D．has put |
By far, there are many problems ________ to be solved.
| A．remaining | B．remained | C．being remained | D．to remain |
We’ll ________ to finish the task whatever difficulty we _________.
| A．succeed; bring out | B．manage; come across |
| C．succeed; come across | D．manage; bring out |
－Are you sure you have to? It’s been so late. Make it another time?
－I don’t know ________ I can do it if not now.
| A．how | B．what | C．when | D．that |
It was a pity that when we hurried to the lecture hall, the lecture_________, so we heard only the end and missed most part of it.
| A．was finishing | B．has just finished | C．just finished | D．had just finished |
I was about to give up the project ______ it hit me_____ I could work with my roommates. That’s to say, I can turn to them for help.
| A．that; whether | B．that; when | C．when; how | D．when; that |