It has been proved_____ taking exercise regularly does good to one’s health.
| A．whether | B．when | C．what | D．that |
The author had qualified as a doctor but later gave up the _____ of medicine for full-time writing.
| A．prescription | B．procedure | C．treatment | D．practice |
What I'm telling you is strictly _____. Do not let anyone know of it.
| A．secretive | B．special | C．individual | D．confidential |
It was with great delight that I read in your February _____ the letter to the Editor written by Prof. Johnson.
| A．issue | B．printing | C．magazine | D．copy |
Tell your brother to come _____, because it's going to rain in a minute or two.
| A．indoors | B．outdoors | C．outward | D．inwards |
A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
| A．permission | B．penetration |
| C．imagination | D．convention |