He found ___________ hard to finish the work in such a short time.

Give me your telephone number ____I need your help.

_______ you have tried it on, you can’t imagine how pretty the new style skirt is.  

When you are learning English, use it, ________ you won’t make great progress.

— Would you like to go hiking with me, Susan?—I’d like to, _______ you don’t want to go alone.