He was reading a book while his mom_______________.

Your pocket money can be used to _____ charity, youused to _______ a lot on snacks.

currentglobal economic crisis, China, though _______to some degree, is undoubtedly acountry recovering the most rapidly from it according to some statistics.

trials, people are ________assigned to a “treatment” group, which benefits from the project, and a “control” group, which does not.

What difficulty will you have ____ people when you stay in a foreign country