名词和主谓一致英语题what we used to think--impossible now does seem po

名词和主谓一致英语题
what we used to think__impossible now does seem possible
a.is
b.was
c.has been
d.will be
2.the company had about 200 computers but only one-third __used regularly
a.is
b.are
c.was
d.were
3.he found a lot of__were__
a.passers-by,grown-ups
b.passer-bys.growns-up
c.passer-bys.grown-ups
d.passers-by,growns-up
4.he left __with my secretary that he would call gaain in the afternoon.he said he would keep__
a.words,his words
b.word ,his word
c. word,word
d.the word,his word
5.it is bad __to speak with your mouth full of food
a.manner
b.manners
c.way
d.thing
6.___ food is kept in his new cave
a.large quantities of
b.a great deal of
c.a large number of
d. quite a few
7.on the wall__ two pictures
a.hanged
b.hangs
c.hang
d.was hanging
请都说出理由.