There (is, are) two classes of pure matter: elements and compounds.
A. Is
B. Are

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Complex Sentences › ViewWhat is the main purpose of using complex sentences in writing?
A. To add length to the writing
B. To express simple ideas
C. To connect ideas with a cause and effect relationship
D. To list multiple ideas
Grammar › View
My parents never let me _______ out alone at night.
A. to go
B. go
C. went
D. so as to
Vocabulary and Grammar › ViewIdentify the correct sentence that uses the past continuous tense:
A. She was studying for her exam last night.
B. She will study for her exam last night.
C. She is studying for her exam last night.
D. She studied for her exam last night.
Passive with Modals › View
The application __________ carefully before any decisions are made.
A. is considered
B. must be considered
C. was considered
D. will consider
