______theyaretwinsisters,theydon’tlooklikeeachother.

How I _____ I could live on the moon.

—Have you finished the work?

—Not yet, but no matter how hard it is, we'll keep ___ until we make it.

Dr.Yangworked______threedaysago.

ProjectHopeisanorganization_____raisesmoneytobuildschoolsandbuybooksforpoorchildren.