[ Grammar ]
By end of this year, Staff Sergeant Liu ____________ in the K9 training unit for thirty years.
A. serves
B. is serving
C. has served
D. will have served

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Grammar › ViewMath exams are ________________ (difficult) English exams.
A. Math exams are difficulter than English exams.
B. Math exams are most difficult than English exams.
C. Math exams are more difficult than English exams.
D. Math exams are difficult than English exams.
Quantifiers › View
I have a cup of tea and ………….. cereal for breakfast.
A. a few
B. a little
Prepositions › ViewIf you’ve got a problem, then do something ______ it!
A. with
B. for
C. about
Grammar › View
My mirror … broken. I need a new one.
A. is
B. are