关于英语现在完成时的一些练习?

关于英语现在完成时的一些练习?
用所给词的适当形式填空
I_______just_______(finish)my homework.
______u ______(find)your science book yet?
If it ___(be)fine tomorrow,I'll go with u
My mother___(come)to see my next Sunday
Howw many sheep__u___(get)?Only one
She doesn't like the children___(play)in the room
The student ___(read)English when the teacher came in?
This factory opened twenty years ago(同义句转换)
This factory____ ____ ____for twenty years