I’m in No.5 Middle School, but my brother ______.

Look! The trailwalkers are walking with ______ bodies. The walk must be very______.

It is well known to all that water, ______ enough, can change into ice quickly．

Isoxygentheonlygas______helpsfireburn? [ ]

Let me teach ____ daughter Japanese.–Thanks. If so, she won’t have to learn by ____.