[ Tense,noun,preposition,quantity ]
It is funny that we have to buy ripe papaya ….. .
A. in kilogram
B. in a kilogram
C. by kilogram
D. by the kilogram

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Grammar › ViewTodd ___ Mr. Chen write the dos and don’ts for the library when(當……時)everybody had lunch in the classroom.
A. helps
B. helped
C. help
D. helping
Grammar › View
Where are my ____________________?
A. pins
B. pen
C. pens
D. pin
Choose the correct article for the sentence: “He is reading ___ exciting book.”
A. a
B. an
C. the
D. no article
Grammar › View
…… helped you to carry these books?
A. Whose
B. Who
C. When
D. Why