[ Tenses ]
Erika.…on her report for three days in a row without much sleep. That’s why she looks so tired.
A. Works
B. Is working
C. Has been working
D. Was working
E. Had been working

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Gerunds › ViewA gerund is a form of a verb that acts as a _____.
A. adjective
B. adverb
C. verb
D. noun
Grammar › View
People often prefer ambiguity to……..
A. Clarity
B. Perversity
C. Rationality
D. Certainty
Cubism,________is an artistic technique, was invented by both Picasso and Georges Braque.
A. that
B. which
C. who
D. whose
Grammar › View
I ___ very hard.
A. work
B. works
