英文达人请进 请做详解

英文达人请进 请做详解
1、If you work hard（ ）,you will not have to sit up all night before the exam.
A.by yourself B.at other times
C.willingly D.with some help
2、Television keeps us informed about( )events and the lastest developments in science and politics.
A.current B.fashinable
C.brand-new D.previous
3、Betty moved from the dormitory( )the noise.
A.because of B.in spite of
C.because D.caused by
4、He ought to have handed in the paper yesterday.That is what he( ).
A.should do B.should be doing
C.should have done D.should