After Yang Liwei succeeded in circling the earth, our astronauts desired to do was walking in space.
A. where
B. what
C．that
D，how
We're considering students' request ______the school cafeteria should provide more kinds of food．
| A．how | B．what | C．that | D．whether |
—Oh, doctor, The wound on my leg is infected.
—You really shouldn’t have left it _______ to the sun.
| A．discovered | B．exposed | C．opened | D．buried |
____ you call me to say you are not coming, I will see you at the theatre at five this afternoon．
| A．Though | B．Whether | C．Unless | D．Until |
—Would you rather come on Friday or Saturday?
—________________.
| A．Yes, of course | B．The other is better |
| C．That's ok | D．Either would suit me |
Relax yourself every day, ________ you'll be too tired to get good grades.
| A．and | B．or | C．for | D．but |