1.In face of the difficulty wu should _______ happy atmosphere.
A.keep up B.insist of C.stick to D.put up
2.I _______ him _______,but he refused.
A.persuaded;to go home B.tried to prevent;going home
3.She can't free herself ________ the idea that someone is watching her all the time
A.against B.of C.for D.at
4.When asked by the police ,he said that he remembered arriving at the party ,but not _____.
A.leaving B.to leave
请说明一下原因