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 |
I decide to ____ a more positive attitude after hearing the moving story of the disabled singer.
| A．adapt | B．adopt | C．accept | D．arrange |
Mark said that he was unfit for the job, so he decided to _____ from the company.
| A．suffer | B．resign | C．retire | D．escape |
—If not controlled, some terrible diseases will spread in the stricken areas after the terrible earthquake.
—So people there are in _____ need of medical teams.
| A．anxious | B．permanent | C．specific | D．desperate |
Foreign trade, the ____ of goods between nations, takes place for many reasons.
| A．exchange | B．bargain | C．production | D．business |
The famous professor’s lectures, though ____ informal, are considered far more informative and interesting.
| A．occasionally | B．constantly | C．regularly | D．usually |