[ Countable - Uncountable ]
The famous scientist is conducting ___ experiment to prove his theory.
A. an
B. some

Random Topics:
Past simple - Irregular VerbsPrepositional PhraseGrammar: is/are/was/wereas...as, comparatives, superlativesFrequencyTenses & AffixesParticiple - ing/ edPast Tense vs Present Perfect TenseRelative & ModalsPassive Voice - Present ContinuousOther quiz:
Identify The Tenses › ViewHarmoni will wrap the gift before her mother’s birthday.
A. Future Simple
B. Future Continuous
C. Future Perfect
D. Future Perfect Continuous
Causative Verb › View
—- its creation in 1903, the High Court of Australia has been responsible for interpreting the constitution.
A. Because
B. Since
C. Unlike
D. While
I don’t _____ my homework, Can you help me?
A. believe
B. understand
C. know
D. do
Grammar › View
It _____________________________ for three weeks, so the land was dry.
A. has been raining
B. hadn’t rained
C. had been raining
D. was raining
