The famous singer one more song for the audience, but he lost his voice suddenly.
| A．would sing |
| B．was going to sing |
| C．Was singing |
| D．had sung |
There is an increasing concern _____________ about Ebola infection. Every country has taken necessary measures to prevent it.
| A．unnecessary | B．sudden |
| C．nationwide | D．worldwide |
In the noisy crowd, I had to raise my voice to make myself ___________.
| A．hear | B．hearing |
| C．to be heard | D．heard |
As we can see, Peter is very happy, so he___________ have passed the exam. After all, it’s not difficult at all.
| A．must | B．would |
| C．could | D．should |
—Is Bob still a volunteer?
—No, but he _____. He worked for the 2008 Beijing Olympic Games.
| A．used to | B．used to be |
| C．used to do | D．was used to |
You’d better _______ because I’m busy writing a letter to my parents.
| A．leave me alone | B．leave me behind |
| C．set me aside | D．set me off |