So difficult______ it to acquire a large vocabulary without the help of a teacher that he was close to giving up .
| A．he have felt | B．have he felt |
| C．he did feel | D．did he feel |
Thomas Edison considered genius to be _____ one per cent inspiration and ninety-nine percent perspiration.
| A．composed of | B．constituted in |
| C．consisted of | D．comprised in |
All foreign visitors are requested to _____ with the regulations in this area.
| A．agree | B．comply | C．consent | D．conform |
These continual _____ in temperature make it impossible to decide what to wear.
| A．alterations | B．vibrations | C．waves | D．fluctuations |
The illness from which Mary is suffering has now been _____ as hepatitis (肝炎).
| A．diagnosed | B．determined | C．deduced | D．discovered |
A completely new situation is likely to _____ when the school leaving age is raised to 16.
| A．arouse | B．rise | C．arise | D．abide |