-- I'm sorry I've left your ball in the classroom.

-- Never mind. ________ it myself.

[　　]

I have bought two pens, ________ writes well.

[　　]

The river runs ________ the forest ________ the lake.

[　　]

They are going through with their highway project, ________ the expenses have risen.

[　　]

The eighteen-storey building, when ________, will shut out the sun ________ up the rooms in my house.

[　　]

Which do you enjoy ________ your spare time, playing cards at home or taking a walk in the park?

[　　]

Yesterday I was walking downstairs when I missed my foot and had a bad fall, nothing serious, ________.

[　　]

At the end of 2002, there were around 3000 foreign printing companies in China, ________ up around 2 percent of national total.

[　　]

Mary wrote an article on ________ the team had failed to win the game.

[　　]

-- Shall I sit at this end or ________ of the boat?

-- ________ if you keep still.

--[　　]