I still doubt _____ he can overcome(克服) all the difficulties..
Tom as well as his parents __________ to work on foot every day.
Many experts hold the view __________ teacher's development is __________ the key to better education lies.
A driver should __________ the road when __________.
The new suspension bridge __________ by the end of last month.
Finally, Tom __________ a good solution to that tough matter.