---You may find the key to the maths problem on page 107. ---Ah, it’s so simple. I wonder why I ________ of that.
The silence of the library _____ only by the sound of pages being turned over.
With the rapid growth of population, the city _____ in all directions in the past five years.
- How long _____ at this job ? - Since 1990.
— When will you come to see me, Dad ? — I will go to see you when you _____ the training course.
My uncle ______ until he was forty –five.