_________ life will continue on the earth for millions of years to come will depend on __________ this problem can be solved.
—Sorry for the delay.I got lost in the mountain. —That's OK.You're safe and that's what________.
—Tom has been fired by his boss. —________?As far as I know,he is a hardworking and considerate fellow.
Annoyed by the salesman's bad manner,John chose ________of the two computers on sale and left.
People develop ________ preference for a particular style of learning at ________ early age and these preferences affect learning.
Four and ________ half hours of discussion took us up to midnight,and ________ break for cheese,chocolate and tea with sugar.