我作的几道改错题，不知对不对，请给指点一下，谢谢！ 改错, 指点

lnddshw

Task 6
Scientists have been （used）（改为using）the following three tests to
Find out how （good）（改为well）people can live in space, First ,they
Tested astronauts on the earth under （condition）（改为conditions）like those in
space. Second, they sent （mouse）（改为mice）and dogs into space to see
（either）（改为whether）they could live there or not. Finally, they sent
people into space.
Task 9
The library is a place where collections
of books are （keeping）（改为kept）. A library has a
great number of reading rooms （where）（改为that）are necessary
for people to study （by）（改为in）. It is in libraries
（where）（改为that）scientists meet to discuss important
problems, exchange experiences or （collecting）（改为collect）
pieces of useful information.
Task 10
Allow me, first of all, on behalf of my teachers
and classmates （giving）（改为to give）a warm welcome to all of
you （comes）（改为coming）from London. It gives us a great pleasure
to have you in our school for a brief visit. You will be glad
to see how well we Chinese （student）（改为students）
are getting along with （their）（改为our）English learning. We think
it a bridge （through）（改为of）the friendship between us and the people
throughout the outside world.
谢谢！

lnddshw

谢版主！！！