Hard______they tried, they failed to climb to the mountain topA．ifB．when.C．asD．since

They are willing ____ mistakes and try again.

______make good progress.A．Only by working hard they canB．By only working hard they canC．O

A: The students work hard. B:_____A．So do they.B．So they do.C．So we do.D．Neither do they.

When people fail to get guidance from traditional ethical basis,______.A．they will denounc

Most American newspapers try hard to entertain their readers because ______.A．they have to

Once we failed to pay the electricity bill, they didn’t hesitate to _________ us ____