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using folk medicines in place of modern medicines
antibiotics in the field medicine
the validity of folk remedies and their use for advances in modern medicines
isolating antibiotics in cheese sugar, and slime
suspected medicinal properties of mold
isolated infectious patients
He is weak in mathematics
He is backward in Mathematics
He is poor in Mathematics
insert 'to' before 'receiving'
replace 'looking forward' with 'expecting'
No correction is required
replace 'strikes' with 'contracts'
No correction is required
This is the tallest tree I have never seen
This tall tree I have never seen
This is the tallest tree I have ever seen
This tall tree I have ever seen
This is the tallest tree I have not yet seen