—Jack, this is the third time that you have been late this week.
—Sorry, sir, but I was ____ for 15 minutes on the way here in the traffic jam.
| A．held up | B．put up | C．taken up | D．given up |
He observed a stranger _______ around the store at 12 p.m. last night.
| A．to hang | B．hang | C．hanging | D．to be hanging |
Once ______ , the plan can’t be changed.
| A．begin | B．beginning | C．began | D．begun |
They asked me so many ______ questions that I got ______.
| A．confusing; confusing | B．confused; confusing |
| C．confused; confused | D．confusing; confused |
.Jumping out of ______ airplane at ten thousand feet is quit ____ exciting experience.
| A．\; the | B．\;an | C．an; an | D．the; the |
I thought it ＿＿ very boring, but it wasn’t.
| A．is going to be | B．was going to be | C．used to being | D．can be |