英语问题！急急急急急急！！！

Question

By the year2020,they( )(finish)building all the gyms.
用括号中词的适当形式填空。最好有解释说明。谢谢！！

Answer 1

will have finish
将来完成时用来表示在将来某一时间以前已经完成或一直持续的动作。经常与before+将来时间或by+将来时间连用，也可与before或by the time引导的现在时的从句连用。
构成：（shall）will+have+动词过去分词
如：By the time you are done with that, the breafast will be ready, and you will be all set.

Answer 2

.A：Hi，Lily！

B：Hi，Jim！

A：---how
many-----------
books
do
you
have？

B：Em，let
me
see.1,2,3....12!
I
have
--twelve------
books.

2.
A：How
many
--candies-------
do
you
have
？

B：I
have--eight-----.

3.
A：How
many
rulers
do
we
have
,Tim
?
B：Oh,
I
--don't
know--------.
A：Guess!
B：Thirteen?
A：Let's
count
!
B：1,2,3...15!
We
have ---fifteen--------rulers.

Answer 3

1.A：Hi，Lily！

B：Hi，Jim！

A：---How-many--
books
do
you
have？

B：Em，let
me
see.1,2,3....12!
I
have
--twelve---
books.

2.
A：How
many
--books-------
do
you
have
？

B：I
have--twelve-----.

3.
A：How
many
rulers
do
we
have
,Tim
?
B：Oh,
I
--don't
know.--------.
A：Guess!
B：Thirteen?
A：Let's
count
!
B：1,2,3...15!
We
have ---fifteen--------rulers.

Answer 4

1.A：Hi，Lily！

B：Hi，Jim！

A：(How
many)
books
do
you
have？

B：Em，let
me
see.1,2,3....12!
I
have (twelve/12)
books.

2.
A：How
many (pens)
do
you
have
？

B：I
have
(ten
pens./10
pens.)

3.
A：How
many
rulers
do
we
have
,Tim
?
B：Oh,
I
(don't
know.)
A：Guess!
B：Thirteen?
A：Let's
count
!
B：1,2,3...15!
We
have (15/fifteen)
rulers.

Answer 5

how
many
12
books
12
don't
know
15

Answer 6

1
How
many

twelve
2
pen
thirteen
3
don't
know
fifteen