1.the black skirt costs 35,and the white one costs 60.the white

1.the black skirt costs 35,and the white one costs 60.the white one is......than the black one.
.the more expensive
.less expensive
.the less expensive
.more expensive
2.the path become .... when we passed the lake.
.narrower
.narrowest
.more narrower
.the narrower
3.this table is too smaill.whats ....length?
.your
.yours
.his
.its
4.i know mr and mrs smith but i dont know ..... daughter.
.theirs
.yours
.his
.their
5.he.....speak three foreign languages.
.can
.may
.must
6.must i come tomorrow?-no,you.....
.neednt
.neednt to
.cant