1.We can finish the work on time because the twins help us（改为同义句）
（ ）（ ）（ ）the twins,we can finish the work on time.
2.Our knowledge of the each is always growing.（改为同义句）
Our knowledge of the each is growing( )( )( ).
3.Man-made satellites have seen set up into space by many countries.(改为主动的）
Many countries ( ) ( )( )satellites into space.
4.You must finish your homework (in two hours).(对括号里面的成分提问）
（ ）（ ）（ ）I finish my homework?
5.That's how to solve the problem .
That's how the problem ( )( ).