It is fairly common in Africa for _____ a group of musicians surrounded by others who also join in the performance.
| A．there are | B．there being | C．there to be | D．there be |
Misunderstandings arising from lack of social communication, if not ______ properly, may lead to serious problems.
| A．handling | B．being handled | C．handled | D．to handle |
Worldwide markets get tighter and the pain only lasts longer ______ international cooperation is strengthened in no time.
| A．because | B．if | C．unless | D．when |
The situation in Haiti after the earthquake was all in a mess, ______ the increasing number of robbery cases.
| A．causing | B．having caused | C．caused | D．to cause |
Measures must be taken before there is another collapse of the coal mine, ______?
| A．must they | B．mustn’t they | C．is there | D．isn’t there |
Look at the naughty boy! You ______ have taught him how to behave himself.
| A．must | B．may | C．can | D．should |