[ Grammar and Idioms ]
What is the meaning of “catalyst” in the context of change?
A. A person or thing that accelerates change or action.
B. A person who stops a process.
C. A slow-moving event.
D. A predictable reaction.

Random Topics:
Giving and Asking for AbilityCan vs be able toGrammar & VocabPresent Perfect, Present Simple, Present ContinuousBe going to / WillThere is or There areVocabulary & Phrasal VerbSentence Structure and Pronoun AntecedentAdverbial Clauses of Reason / CauseConjunctive AdverbOther quiz:
Tenses › ViewWhat is the future progressive form of the verb in “His friends will call at the next holiday or break”?
A. will be calling
B. calls
C. called
D. is calling
Verb Tenses and Usage › View
. Tom ___ his leg yesterday while playing football.
A. has broken
B. broke
C. was breaking
Prepositions › Viewcovered_______
A. with
B. for
C. in
D. from
Adjective › View
Did you see the magician? He was ___!
a.amazed
b.amazing
