[ Grammar ]
As I walked down the corridor, I heard someone ____ in one of the classrooms.
A. sing
B. sang
C. sings
D. singing

Random Topics:
Gerunds & Infinitives + VocabularyDistinguishing Future TensesProgressive Perfect and Simple Verb TensesThere is or There areGrammar: Have toQuantifiersTenses StructurePresent Continous TenseModal Verbs and ConjuctionsModals and Modal PerfectsOther quiz:
Grammar › ViewAs the human population grows and grows, natural resources are being used at a rapid rate, and large areas of forest are being converted ____ human use.
A. for
B. to
C. into
D. in
Vocabulary and Sentence Structure › View
Every year, millions of people from the countryside move to urban areas.
A. Rural
B. disadvantaged
C. modern
D. developed
Grammar › ViewYou can __________ take the train ________ bus to Kuala Lumpur.
A. so, but
B. either, or
C. neither, nor
D. either, because
Adjective Clause › View
I played there every day with her daughter, ______________ name was Katy.
A. Which
B. Whose
C. That
D. Whom
