Only when David did it a second time _________.
| A．he realized his mistake |
| B．he was realizing his mistake |
| C．did he realize his mistake |
| D．he did realize his mistake |
In order to _____ the rising production costs, the subscription rates have been increased.
| A．add up to | B．look up to | C．cut short | D．keep up with |
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 |