[ 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:
Grammar › ViewMy uncle is taller than my father, but my father ….
A. older
B. is older than
C. is older
Mixed General Quiz › View
Don’t rock the ___ if you don’t want to get wet.
a. boat
b. vote
She 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