1¡¢About ______ of the surface of the earth is covered with water.

A.three fourth          B.three fourths
C.third fourth          D.third fours

2¡¢Is _____ possible to master a foreign language without much memory work?

A.this       B.that       C.one        D.it

3¡¢She insisted that he ______ her car and ______ prison.

A.stole; had been put into
B.steal; be put into
C.had stolen; should be put into
D.had stolen; must be put into

4¡¢—Come on, please give me some ideas about the project.

—Sorry. With so much work ________ my mind, I almost break down.

A.filled                B.filling
C.to fill                D.being filled