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I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

A．1ook at．    B．1ook into    C．1ook after    D．1ook out

After 15 years in the USA，he has finally decided to__________American citizenship.

A．concentrate on　 B．a(chǎn)pply for　　　 C．1ook out for　　　 D．a(chǎn)ppeal to

we can’t wait any longer．We must _______a new way to solve the problem right away．

     A．make up                B．figure out       C．1ook out          D．pick up

I wrote a letter of complaint(投訴)，and the airline have promised to _______the matter．    

A．1ook at．    B．1ook into    C．1ook after    D．1ook out