--- ________ I remind you of is to return the book to our English teacher.
---I will give it to him _________ I see him.
| A．That; immediately | B．What; directly | C．What; while | D．Whether; once |
Knowing how long the test would last, the students who finished _______ back and waited until the end of the exam.
| A．settle | B．settled | C．settling | D．to settle |
I thought things would get better, but _______ it is they are getting worse.
| A．before | B．because | C．as | D．after |
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 |