Some forms of algae have to growing on ice.
| A．adopt | B．adapt | C．advocate | D．addict |
The long-lasting meeting, filled with arguments and quarrels, ended in disorder,no conclusion.
| A．reached | B．to reach | C．reaching | D．would reach |
Leaders from different parts of the world took part
in the discussionthe international treaty.
| A．which leads to | B．leading to | C．led to | D．led to have |
Du Vigneaud , a well-known American scientist,the Nobel Prize
chemistry in 1955.
| A．accepted; for | B．received; on | C．won; for | D．gained; for |
By the time hethe railway station ,the train.
| A．reached ; left | B．reached ; had left |
| C．arrived ; had gone | D．got ; had been away |
—Where is Mr Smith?
—Hein prison for more than two months.
| A．has been | B．has been sent | C．has been thrown | D．has been put |