We didn’t know you were in trouble at that time, ________we would have given you a hand.
| A．while | B．when | C．therefore | D．otherwise |
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 |
. I must go now. _____, if you want that book I'll bring it next time.
| A．Incidentally | B．Accidentally |
| C．Occasionally | D．Subsequently |
Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
| A．process | B．practice | C．procedure | D．program |