When they went to the theatre, the play ______ for five minutes.
| A．had begun | B．has begun | C．had been on | D．was on |
The dull wetland _______ the moment the first ray of sunlight shines on it. Thousands of creatures living in it wake up and begin their life of a new day.
| A．stays alive | B．begins to live | C．makes a living | D．comes to life |
Experts say walking is one of the best ways for a person to _______ healthy.
| A．handle | B．stay | C．maintain | D．reserve |
_______ unexpected heavy rain usually causes _______ great change.
| A．The; the | B．An; 不填 | C．An; the | D．The; a |
---It’s getting late. I am afraid I must be off now.
---_______!
| A．Go slowly | B．So long | C．No problem | D．All right |
Many British people have noticed that butterflies _______ from its natural habitats during the past several years.
| A．are disappearing | B．have been disappeared |
| C．have been disappearing | D．will have disappeared |