.They were __________ to produce carbon,nitrogen,water and other gases.
| A．in time | B．at a time | C．at one time | D．on time |
The bank is reported in the local newspaper ________ in broad daylight yesterday.
| A．being robbed | B．to have been robbed | C．robbed | D．having been robbed |
Though _______money, his parents managed to send him to university.
| A．lacked | B．lacking of | C．lacking | D．lacked in |
_____ 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 |
The discovery of new evidence led to _________.
| A．the thief having caught | B．catch the thief | C．the thief being caught | D．the thief to be caught |
Not only_______give us relaxation and pleasure,but also_____increase our knowledge.
| A．can travel;it can | B．travel can;can it |
| C．can travel;can it | D．travel can;it can |