[ Modals ]
People ___ throw garbage into the river.
A. must
B. mustn’t
C. may
D. are

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Grammar › ViewComplete the sentences with the correct form of the modals and verbs in parentheses:
We ___________ (must / maintain) excellence in our customer service or people will complain.
___
A. mustn’t maintain
B. must maintain
C. must maintains
Quantifiers › View
……………………….bread do you eat?
A. How many
B. How much
C. A lot of
D. Many
Articles › View__ flights attendants have to speak several languages.
A. a
B. an
C. the
D. no article
Vocabulary › View
The sentence that states the central idea of a writing assignment and helps control the ideas within the essay.
A. reason
B. bold
C. thesis statement
D. opinion
