— I am going to the dentist at 4 o'clock and it is 3:30 now.— Well, if you ______ leave earlier today, please ask the director for permission.
To improve your reading ability, you should ____ half an hour every day for learning new vocabulary.
Though he had tried to climb to the top of the mountain several times, he didn't _____.
The good thing about children is that they _____ very easily to new environments.
Your performance in the driving test didn’t reach the requirements. _______, you failed.
The Chinese are proud of the Shanghai Expo ____ successfully in Shanghai in May,2010.