7- Scientists are always trying to find ---------- for diseases.
a) a cure b) an antiseptic c) an infection d) an antidote
9- The famous surgeon has.................... many successful operations
a) composed b) carried c) done d) made
Job .............. isn't an easy task .
a) founding b) hunting c) searching d) looking
The wind ...........…sail ships and boats for centuries.
a) was used b) is used c) has used d) used to
مع شرح قاعدة الجملة الاخيرة
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