[ Tenses ]
While Ms. Nhung was teaching in Class 4B, she ______ a piercing scream outside.
A. had heard
B. has heard
C. was hearing
D. heard

Random Topics:
Conditionals / Unreal PastArticles and DeterminersModal Verbs and ConditionalsGrammar- Later/LatterPassive VoicesPast Simple (to be)Action, Helping & Linking VerbsArticles and QuantifiersVerb & GrammarPast Simple or Past ContinuousOther quiz:
Adverbs › ViewI can’t understand what he is talking about …….. his accent.
A. because of
B. because
Many vs. Much › View
Do we have enough time ? There are …………………….. places to visit.
A. Too many
B. Too much
Your friends won’t be happy ………….. they hear the good news.
A. if
B. as soon as
C. unless
Adjective and Adverb › View
The skaters performed most gracefully.
A. adjective
B. adverb
