[ 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:
Present, Past, and Future Time › ViewIt (rain) ______________________ for a very long time.
A. It have rained for a very long time
B. It has rained for a very long time
C. It have rain for a very long time
D. It have raining for a very long time
Pronoun › View
_____ am in the yellow bus
A. we
B. He
C. I
Grammar & Vocabulary › ViewI 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