In my opinion, life in the twenty-first century is much easier than ___________.
| A．that used to be | B．it is used to | C．it was used to | D．it used to be |
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 |
Occasions are quite rare ______ I have the time to spend a day with my kids.
| A．which | B．when | C．where | D．what |
The magazine ______ the cover is missing was borrowed from the school library.
| A．its | B．who’s | C．whose | D．of which |