A.is 
B.are 
C.was 
D.were

A.went  
B.had gone
C.has gone 
D.goes

A.climb 
B.climbing
C.to climb
D.climbed

A.energy
B.source
C.power 
D.material

A.Wow, you got the idea.
B.No, never mind.
C.Pretty well, I guess.
D.Sorry, I'm new here

A.comes
B.come 
C.had come  
D.coming

A.at
B.on  
C.in
D.of

A.sings
B.sang
C.has sung
D.is singing

A.What a pleasure  
B.It's pleasure
C.I'm very pleased  
D.Pleased to meet you

A.younger
B.young
C.the youngest 
D.youngest

A.to get  
B.to getting  
C.in getting  
D.and getting