Excuse me. I _________ I was blocking(挡) your way.
| A．didn't realize | B．don't realize | C．haven't realized | D．wasn't realizing |
Though the key was pressed, nothing ______ on the screen.
| A．appeared | B．was appeared | C．appears | D．is appeared |
---You never have sweet snacks, do you?
---________. Though I know they’re bad for our health.
| A．Yes | B．No | C．Yes, I don’t | D．No, I do |
He was often seen _________ with charity work last year.
| A．to help | B．helped | C．helping | D．help |
Please don't stand up in class until you.
| A．were told to | B．are told to | C．were told | D．are told |