[ Grammar ]
Please ______ until after the plane ______.
A) not smoke / takes off
B) don’t smoke / has taken off
C) don’t smoke / took off
D) not smoke / has taken off

Random Topics:
Simple Future TenseDeterminers & QuantifiersSentence Structure and Pronoun AntecedentPrepositions of TimePresent simple & ContinuousElectricity VocabularyPresent Perfect and Present Perfect Progressive TensesTenses, Determiners & Subject Verb AgreementLinking Words and ConjunctionModals for Advice, Obligation/Prohibition, Necessity and Lack of NecessityOther quiz:
Subject-Verb Agreement › ViewThe books borrowed from the Library _____ on my desk.
A. Is
B. Was
C. Are
D. Were
Modal Verbs › View
Lily has an important exam tomorrow, and she realizes that she needs to study hard to pass.
What is the correct modal verb to express a strong necessity for her to study?
A. must
B. should
C. could
D. might
The First Conditional › ViewJoe …… happy if she …… .
A. Is, will come
B. Is, come
C. Will be, comes
Conditional Sentences › View
If she ____ harder, she will pass the exam.
A. study
B. studies
C. studied
D. studying
