[ Tenses & Passive ]
Rubber trees ______ in tropical countries .
A. grow
B. are grown
C. grew
D. are growing

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Perfect Verb TensesWord Form & Verb TenseModals in the PastPast Tense, Recount Text, and Future TenseSentence LabelingElectricity VocabularyLinking Verbs & Helping VerbsModal Verbs for SpeculationSimple Tenses in EnglishAlong & AgainstOther quiz:
Modal Verbs › ViewYou must _______________. It is the most important traffic rule, I think.
A. cross the road
B. drive carefully
C. be careful
D. stop at the red light
Grammar › View
I live in the ____________ comfortable city in the world.
A. more
B. most
C. less
D. than
Homonyms › ViewThe ___ character in the play is a middle-aged widow.
a. principal
b. principle
Homophones › View
Two of the same things are a
A. Pare
B. Pear
C. Pair
