He owes his great success（）hard work and opportunity.

单项选择题（）by Columbus, all the arguments came to an end.

A．Tile new land was discovered
B．Was the new land discovering
C．With the new land discovered
D．With the new land discovering

单项选择题Television is another major instrument of communication,（）us to see as well as to hear the performer.

A．permitted
B．to permit
C．permitting
D．being permitting