I have bought two pens, ____ write well.
As we all know, two thirds of the earth’s surface is water, ___ a lot of fish.
Jack is the ______- child in the family; he wants to have a brother.
Only in this way, directed by the teacher, ______work out the problem the day before.
He went swimming on a hot day, ________.
The wounded policeman ____though doctors made every effort to save him.