We were told not to touch the equipment in the laboratory unless ________.
| A．allowed to do | B．allowing to do | C．allowed to | D．allowing to |
.It is uncertain whether the medicine will work on the this cold, _________？
A. is it B. isn't it C, will it D. won't it
.It is definite that new digital mobile phones have less radiation, but that does not________mean that they should be used without caution.
| A．obviously | B．necessarily | C．generally | D．eventually |
.____________the advantages against the disadvantages, I decided to take up the job as a clerk in the bank.
| A．To weigh | B．Weighing | C．Weighed | D．Having weighed |
The previous lecture focused on the reading problems in new words, while this lecture will turn to___________in complex sentence structures.
| A．that | B．one | C．those | D．ones |
.Being exposed for a long time_____strong sunlight might seriously damage your skin.
| A．in | B．under | C．to | D．over |