As is known to all, the financial crisis firstly broke out in the United States, ______ the group of developed countries.
| A．belonging to | B．relating to |
| C．aiming at | D．coming to |
Tony failed to finished his paper on time. If he ______ me about it, I would have came to his help.
| A．tell | B．told |
| C．had told | D．would tell |
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 |