选词填空be equal to,participate in,keep one's words,every four y

选词填空
be equal to,participate in,keep one's words,every four years,be involved in,refer to,pick up,even ehough,in case,in many ways
1.Although the tricky matter can be solved _____ ,you might as well choose ehe most effcient one.
2.He is a green hand.Thus,he doesn't seem _____ meeting our demand.
3.One of the most important things of making friends is ____ ,no matter how hard it may be.
4.In the quake-hit area,many volunteers _____ the rescue work.
5.The Olympic Games are held ____ ,and the 29th Game are around the year.
6.During his stay in the United States,he ____ ,some American English.
7.You'd better take a dictionary with you when you read English novels ____ you meet with some difficult new wards.
8."The man _____ is innocent of crime." said the policeman.
9.Do you know how many countiries will ____ the 2010 World EXPO?
10.He tried everything to save people after the volcano erupiton _____ it might cost him his own life.