We laugh at jokes, but seldom __________ about how they work.
| A．we think | B．think we | C．we do think | D．do we think |
—Mom, today I received a message telling me to send money to the account.
—Delete it. It’s a trick. Many a person ________ by such tricks.
| A．have been cheated | B．were cheated |
| C．has been cheated | D．was cheated |
Teachers have to constantly update their knowledge in order to maintain their professional ________．
| A．consequence | B．independence |
| C．competence | D．intelligence |
—China is developing rapidly.
—Yes, to make our country more prosperous, we should firmly the principle of scientific development.
| A．contribute to | B．subscribe to | C．stick to | D．turn to |
Saving and recycling are long-term projects _______ determination matters a great deal.
| A．that | B．which | C．whose | D．where |
Jack wasn’t saying anything，but the teacher smiled at him ________he had done something very clever．
| A．as if | B．in case |
| C．while | D．though |