The UN has warned that,_____ natural systems like forests and wetlands disappear , mankind is losing the services they provide such as protection from extreme weather.
| A．while | B．once | C．when | D．as |
Take your time --it’s just short distance from here to restaurant.
| A．x; the | B．a; the | C．the; a | D．x; a |
Right now the writer and manager_____busy preparing for the following meeting.
| A．is | B．Are | C．was | D．were |
The ________ look on her face suggested that she _________ the exam.
| A．worrying ; didn’t do well in | B．worried ; didn’t do well in |
| C．worried ; did well in | D．worrying ; does well |
With a lot of difficult problem___, the newly-elected president is having a happy time.
| A．settled | B．setting | C．to settle | D．being settled |
He managed to make himself____with his___English.
| A．Understand; breaking | B．understand, broken |
| C．understood, breaking | D．understood, broken |