Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.
| A．cautious | B．thoughtful | C．considerate | D．curious |
—That must have been a pleasant experience.
— yeah, we ourselves.
| A．have been enjoying | B．enjoyed |
| C．were enjoying | D．had enjoyed |
time tomorrow, I would teach you how to play the piano.
| A．Had I had | B．If I would have | C．If I have | D．Were I to have |
The boy hot on the forehead. He must be sent to the hospital at once.
| A．is felt | B．felt | C．feels | D．was felt |
—It looks as if it’s going to rain, but I’m not sure whether the windows are shut in my apartment.
—You as well go back to have a look.
| A．should | B．might | C．need | D．can |
The number of sharks has fallen greatly in the past three years, so measures must be taken to oppose sharks illegally.
| A．people to hurt | B．people from hunting |
| C．people hurt | D．people’s hunting |