[ Grammar ]
A catalytic agent such platinum may be used so that the chemical reaction advances more rapidly.
A. such
B. so
C. advances
D. rapidly

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Conditional Sentences Type 1Definite and Zero ArticleNoun ClausePunctuation and GrammarSimple Past TenseFuture Perfect ContinuousIndefinite and Intensive NounPhrase vs ClauseModal VerbActive and Passive voiceOther quiz:
Modal Verbs › ViewStudents (pay) attention to the teacher if they want to learn.
A. have to
B. must
C. should
D. mustn’t
Grammar › View
A. lamp
B. mirror
C. cabinet
Andrew had a job as a shop assistant during his ____________________.
A. working holiday
B. school camp
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Ali: I can’t believe I lost my wallet! Sara: ___________ it at the café yesterday?
A. Did you leave
B. Have you left
C. Were you leaving
D. Do you leave
