You are working too hard. You'd better keep a ________ between work and relaxation.

Shanghai has become a (n) ________ of the world’s attention with the 2010 Expo being held at the moment.

I’ll let you know_____ I receive Brain’s e-mail message.

When I first set _________ in Germany, I didn’t know what the future might have in _________ for me.

Always read the_______on the bottle carefully and take the right amount 0f medicine。