A.do | B.had done | C.did | D.would |
A.exposed to | B.filled in | C.caught on | D.kept up |
A.collect | B.take | C.receive | D.accept |
A.will take off | B.is going to take off |
C.is taking off | D.takes off |
A.show up | B.work out | C.take up | D.pick out |
A.equal | B.match | C.qualify | D.fit |
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