We should prevent such a silly mistake _____ again.
| A．occurring | B．to occur |
| C．to be occurred | D．from being occurred |
After decades of effort, the city is still trying to _____ how to stop smoking in public places.
| A．try out | B．let out | C．figure out | D．run out |
Lawmakers have approved the measures_____ protecting the personal information of Web users.
| A．to aim to | B．aiming to | C．aimed at | D．are aimed at |
After the war, a new school building was put up ______there had once been a theatre.
| A．when | B．in which | C．the place where | D．where |
Michelle Obama said, “For Barack, success isn't about how much money you make; it's about the______ you make in people's lives.”
| A．sense | B．judgment | C．way | D．difference |
Look at the trouble I am in! _______I had followed your advice.
| A．Only if | B．If only | C．Even if | D．So long as |