____ life will continue on the earth for millions of years to come will depend on _____ this problem can be solved.
His room was neat,________with the simplest essentials,a bed,a chair and a table.
The funny story________a loud laughter in the classroom.
The boy knocked down by the car stood up all by himself,________unhurt.
If he________that he________to work there,everything would be OK now.
What do you suggest________more suitable?