[ Must / must not ]
You … be rude to your parents
A. must
B. mustn’t

Random Topics:
Definite ArticlesNoun, Verb, AdjectiveModals for RecommendationsGerund, Infinitive & ModalsPresent Simple & Present ContinuousStative Verbs and TensesCommon ErrorAdjectives and comparisonsAdjective ClauseAuxiliary WordsOther quiz:
Some vs. Any › View“Which CD do you want to put on?” “Oh, … . I just want to hear some music!”
a. some
b. any
Prepositions › View
We’re really looking forward _______ seeing you again.
A. to
B. in
C. with
D. for
Vocabulary › Viewa device that has electrical resistance and that is used in an electric circuit for protection, operation, or current control
A. resistor
B. utilities
C. appall
D. assessment
Prepositions of Time, Place, and Movement › View
The bus is coming… the street.
A. towards
B. over
C. down
