1、He raised his eyebrows and stuck his head forward and ______ it in a single nod， a gesture boys used then for OK when they were pleased.
A、shrugged B、 tugged
C、 jerked D、twisted
2、Many types of rock are ______ from volcanoes as solid, fragmentary material.
A、 flung B、propelled
C、ejected D、 injected
3、Many Europeans _______ the continent of Africa in the 19th century.
A、 exploded B、 explored
C、 exposed D、 expanded
4、The police are _______ the records of all those involved in the crime.
A、 looking into B、 looking after
C、 looking out D、looking on
5、She was quite sure that she ______ the lights before she left the classroom.
A、will turn off B、 has turned off
C、would turn off D、 had turned off