All the students ________ the class work when the teacher came in.
A. are doing
B. were doing
C. will be doing
D. have done

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Grammar › ViewWhich word or phrase best completes the sentence below?
______________________, for all the reasons I have mentioned, Fletcher Park should have a visitor’s center.
A. First of all
B. For example
C. In conclusion
D. In the meantime
Grammar › View
Identify the case of the underlined pronoun in the following sentence.
After lunch, we completed the worksheets our teacher had given us.
___
A. Subject pronoun
B. Object pronoun
The students in my school _____________science when it involves a field trip to the zoo.
A. enjoy
B. enjoys
Tenses › View
He ________ for twenty years before he retired last year
A. had been teaching
B. has taught
C. was teaching
D. has been teaching
