[ Grammar for TOEFL ]
The tetracyclines, _____ antibiotics, are used to treat infections.
A. are a family of
B. being a family
C. a family of
D. their family is

Random Topics:
Simple TensesArgumentative VocabularyCommunicative GrammarComplex SentencesFuture PlansPrepositions of TimeNoun Clauses with THATActive & Passive VoiceTenses - AuxiliariesCausative VerbOther quiz:
Tenses › ViewI ___ you with your homework as soon as I ___ writing these reports
A. Will help / have finished
B. am helping / have finished
C. have helped / am finishing
D. was going to help / will finish
E. help / am going to finish
TOEIC Grammar and Vocabulary Review › View
If Mr. Ross had been promoted, he ………….. a staff of 20 people.
A. will supervise
B. would supervise
C. will have supervised
D. would have supervised
Tenses › View‘We were studying in Bangkok’
A. Past Simple
B. Past Continuous
C. Future Perfect
D. Present Continuous
Grammar: Simple Past and Past Continuous › View
You look tired. I think you should go to _____ bed early.
A. the
B. ∅
C. a
