Oh, it’s you, Ella! Your voice sounds very different _____ the phone. What’s happening?[ ]

No, I don’t remember how many years ago _______ I last visited it.

Under no circumstances, he was warned, _____ to give the password to someone else.

_____ may I keep these books?— For two weeks.[ ]

A: How many students can you see in the reading room?B: _______________.