Today Bob was late again for class because he overslept(睡过头), but he （ ） an excuse of being ill.

（ ） is known to all, the earth moves around the sun once a year.

Harmonious marriage, however, does not necessarily （ ） much sharing of interests and responsibilities.

When he really does something wrong, he is willing to （ ）.

Do you mean this is the_____decision you have made after thinking for hours?

The committee members meet _____ every Saturday and Sunday mornings.

Only when （ ） in the afternoon （ ） able to leave.

Please （ ） the water tap when you have finished your washing．

Proper_____can ease people’s relationship and make their conversation more pleasant.

The two companies decided to （ ） on a project concerning animal cloning.

Her sister always spends so much _____ her clothes that she can’t manage to live with her salary.

You’ve never told me why you didn’t come to my birthday party， _____?