The teacher taught us to find a planet in the solar system in his last lesson, ________ everything through jokes.
| A．having explained | B．explained |
| C．to explain | D．explaining |
---Look, our headmaster is over there, playing basketball with some students of our class.
--- Oh, he must be ________ to his students.
| A．possible | B．valuable | C．available | D．accessiblee |
—Have you seen my dictionary?
---- Is it _______ you bought last week? Perhaps _______ is on your bed.
| A．one; that | B．the one; it | C．the; there | D．one; here |
Your niece is very strict and ______ worth teaching, but your nephew is not. Look, he is now ______ asleep in class.
| A．well; fast | B．much; very | C．very; fast | D．well; very |
Our school has used computers in teaching for ten years. As a result, not only______, but students become more interested in their lessons.
| A．has teachers’ energy been saved | B．saved was teachers’ energy |
| C．teachers’ energy has saved | D．was saved teachers’ energy |
I arrived home at midnight, _______ my parents had been waiting for nearly three hours.
| A．at that time | B．by that time | C．at which time | D．by which time |