I ________this book for about a month, so I have to return it as soon as possible.
-- I hope you don’t mind my opening the door. ---- ________
--Having many helpers makes a task easier and faster to finish.- I think so_______.
The disabled _____ able to do the same things as common people.
Public signs keep ________ from danger.
If you try to do many things______, you’ll become tired out.