Students with strong motivation are more likely to succeed t

Students with strong motivation are more likely to succeed than______with poor motivation.
A.do those
B.are those are
C.those have
D,are those
Now more and more people have cosmetic surgery,I mean,it is a trend ____on increasing.
A,in which to keep
B.to keeping
C,for them to keep
D.that just keeps
选择什么?为什么这么做?