[ Grammar ]
Companies always ________ market research before they launch a new product.
A. do
B. make
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Conjunctions and Preposition › ViewThe river water is severely polluted, mostly________ the dumping of raw sewage.
A. due to
B. lead to
C. because
D. so
Present Perfect Tense › View
Have you ever … the beautiful desert scenery?
- see
- seen
Vocabulary › View
a strong drive for success
A. ambition
B. affection
C. disgrace
D. sincerity
Modal Verbs › View
People __________ go outside without a mask. (It’s not allowed)
A. can
B. must
C. have to
D. can’t
E. don’t have to