. --- It remains to be seen _____ the plan can be carried out. --- It is up to you.
. — You must obey every word of mine! — _____ I don’t?
16. The river,______the bank are covered with trees, is very long.
The way she dealt with the problem is quite different _______ her parents were used to.
While building a tunnel through the mountain, ________ .
Lei Feng is always ready to help others when they are in trouble and he never ______ their request.