● 自主质疑
1 on condition that
2 on no condition=in no case
3 uncover a pan
4 feed sb on sth=feed sth to sb
5 feed the machine/computer with sth
6 be fed up with=be tired of
7 a solution to sth
8 be faithful to sth/sb
9 a faithful reader/servant
10 concerned parents
11 all members concerned
12 be concerned about
