He is so busy with the research _____ he has no time left for any other activity.
| A．which | B．that | C．why | D．Because |
It was unbelievable that the fans waited outside the gym for three hours just ____ a look at the sports stars.
| A．had |
| B．having |
| C．to have |
| D．have |
____ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
| A．Put |
| B．Putting |
| C．Having put |
| D．Being put |
_____ to sunlight for too much time will do harm to one's skin.
| A．Exposed |
| B．Having exposed |
| C．Being exposed |
| D．After being exposed |
He got well-prepared for the job interview, for he couldn’t risk ____ the good opportunity.
| A．to lose |
| B．losing |
| C．to be lost |
| D．being lost |
Though _______money, his parents managed to send him to university.
| A．lacked |
| B．lacking of |
| C．lacking |
| D．lacked in |