Martin was once ________ “problem student”, but now he’s one of _______

Martin was once ________ “problem student”, but now he’s one of ________ top students.

#33575

a, a

a, the

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Teaching is _________ interesting work.

#34233

a very

 ---- Can you take photos with elephants? ---- Certainly. ______ elephant is ______ useful animal. I like them.

#32959

A, an

An, an

The, an

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Don’t you think this is          useful advice?

#34583

the

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This is ____ orange book and that is ____ apple.

#33018

a , an

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There is ______ “u” and ______ “s” in the word “bus”.

#33430

a, a

a, an

an, an

an, a

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