By the time Billy was 6, he in the sea.
A.had already swum | B.was already swimming |
C.has already swum | D.already swam |
Does ________ matter much if they do not come tomorrow?
A.this | B.it | C.that | D.he |
The bell ____ the end of the period rang and we had to stop our discussion
A.indicating | B.indicated |
C.to be indicated | D.being indicated |
One-third of the area ________ covered with trees. About seventy percent of the trees _______ been planted recently.
A.is; has | B.is; have | C.are; have | D.are; has |
Neither Tom nor his parents ________ at home.
A.is | B.are | C.has | D.was |
--It really shocked us that he should have made such_______ rapid progress in his study in such a short time!
--No surprising. He has been making _______ most of his spare time to study.
A.a; the | B.a; / | C./; the | D./; / |