ys,many people walk to work______ Copenhagen Conference calling for living alow—carbon lifestyle to cope with global warming

下列各句中，没有语病的一项是（ ）

The watch is as asthat that one.

Those T-shirts are usually $35 each, buttoday they have a ______ price of $ 19 in the Shopping Centre.

There is such a problem _________ we allshould _________.