crowd in, concern oneself with, refer to, move off, carry on,
look down upon, fight for, by chance, come across, devote to
Human beings have been ______ a peaceful world for a long time.
I ______ an old friend whom I hadn’t seen for nearly 5 years in the street this morning.
More and more people are ______ environmental problems.
When Liu Xiang ______, his fans were still waiting there as if he would come back.
With so much noise around us, I found it hard to ______ a conversation.
It is wrong to ______ the disabled. Believe it or not, they can do many things to can’t do.
After the war, the scientist ______ all his time ______ his studies.
The speaker ______ his latest book again and again during the speech.
He did not do that on proposed but ______, so don’t be angry.
Many thoughts ______ on me but I don’t know how to express them.