A.don’t | B.not to | C.shouldn’t | D.to not |
A.go | B.went | C.to go | D.going |
A.keep | B.protect | C.permit | D.prevent |
A.So as to master | B.Mastering | C.Mastered | D.To master |
A.to work with them in their own environment | |
B.to prove the way people think about chimps was wrong | |
C.to discover what chimps eat | D.to observe a chimp family |
A.exhausted | B.injured | C.ridiculous | D.delighted |
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