[ Vocabulary ]
a necessary predecessor
A. Incompatible
B. Catalyst
C. Precursor
D. Synthesis

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Present Perfect and Present Perfect Progressive TensesShould and Shouldn'tPresent tense AffirmativeGrammar - could / could notVocabulary and ModalsTime Clauses of FutureEssential and Nonessential ClausesNounsPresent Simple: affirmative, negative, interrogativeDo not or Does notOther quiz:
Conjunctions › ViewThe film is very interesting. It’s both moving ________ funny.
A. and
B. but
C. although
D. or
E. because
Conjunctions › View
She wants to play soccer ___________ go swimming.
A. but
B. and
C. because
D. or
Grammar › ViewShe worked ___ a rich family and her job was to care ___ the sick grandmother.
A. on
B. in
C. for
D. about
E. to
Grammar › View
Your watch is _________ than mine.
A. the most cheap
B. cheaper
C. more cheap
D. the more cheaper
