. Teachers recommend parents ___ their children under 12 to ride bicycles to school for safety.
| A．not allow | B．do not allow | C．couldn’t allow | D．mustn’t allow |
_______ to the discovery of radium, Madame Curie plays an important role in modern
science.
| A．Devoting | B．Devoted |
| C．Being devoted | D．Having devoted |
The couple _________ last week, which surprised their friends and relatives greatly because they appeared that happy all the time.
| A．broke up | B．put up | C．turned up | D．made up |
---Tom hurt his left leg in the game this morning.
---Really? It would take at least two weeks ______ he could recover and return to school.
| A．when | B．that | C．since | D．before |
His father insisted on punishing him, but he insisted he had _______ to do with the matter.
| A．something | B．a lot | C．nothing | D．anything |
---Does Lucy enjoy singing?
---Yes, she does. I have never seen anyone else that is as ________ about singing as she is.
| A．worried | B．cautious | C．enthusiastic | D．responsible |