Her brother is only two years old， so he is ______young ________dress himself.

–I believe that more effective measures have to be taken before we can breathe cleaner air.–______. Air pollution has become too serious a problem.

下列各句中，没有语病的一句是（ )

Howmuch is _______ for weight.

How about your journey to Mount Emei? —Everything was wonderful except that our car ________ twice on the way.