________ of my sisters are experts in agriculture. Helping the farmers improve their
farming techniques _________their duty.
| A．Each; are | B．Both; is | C．Neither; are | D．None; is |
. Although Lucy was slimming, she found cream cakes quite _____.
| A．irregular | B．inevitable |
| C．incredible | D．irresistible |
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 generation _____ makes it difficult for parents to understand their children’s opinions.
| A．division | B．gap | C．separation | D．interval |