—Is the boy in white clothes your friend, Kangkang? —No. ____ in black clothes is.

All of us find ________ necessary to take exercise every day. 

—Do you like junk food ?—Yes, I love hamburgers very much.  I often eat           .

Daniel found ___ easy to finish writing the report on wildlife.

— I like speaking better than listening in English learning.—Oh, really? I think you should be good at          of them.