4.
A. As
B. Unlike
C. Like
D. Since
5.
A. from
B. to
C. into
D. for
6.
A. ratify
B. testify
C. certify
D. gratify
7.
A. make easy
B. make it easy
C. make hard
D. make it hard
8.
A. extinct
B. extent
C. extant
D. exterior
9.
A. had shifted
B. have shifted
C. shifting
D. shifted
10.
A. Nevertheless
B. Moreover
C. However
D. Therefore