1.As a senior professor she should have known better _____to get involved in such a scandal.

1.As a senior professor she should have known better _____to get involved in such a scandal.
A and not B but not C than D than not
2.It is easy to pay lip service to the idea of equality for women,but in practice this is often___________.
A difficult to achieve it
B difficultly achieved.
C difficult to achieve
D difficultly achieving.
3.it turned out that the project required 2 billion more than ___________.
a.has been invested
b.it has been put in it
c.have been invested in
d.it have been put in it