John came here _______ the evening _______ October 12th. [ ]

Where ______________? – An art exhibition. I think it’s really worth _______ and we can learn a lot from it.

When Tom got to the examination room, he realized he ______ his pen at home.－Oh, he is too careless.

I called you, but nobody answered. Where ________ you?

As volunteer teacher in the rural area，she has opened up students’ eyes to the outside world.