I won’t call you ______ something unexpected happens.
| A．unless | B．whether | C．because | D．while |
Every day________a proverb aloud several times until you have it memorized.
| A．read | B．reading | C．to read | D．reads |
It was with the help of the local guide ________ the mountain climber was rescued.
| A．who | B．that | C．when | D．how |
It was only after he had read the papers________Mr.Gross realized the task before him was extremely difficult to complete.
| A．when | B．that | C．which | D．what |
It was not until near the end of the letter________she mentioned her own plan.
| A．that | B．where | C．why | D．when |
Only by increasing the number of doctors by 50 percent________properly in this hospital.
| A．can be the patients |
| B．can the patients be treated |
| C．the patients can be treated |
| D．treated can be the patients |