We’ll go to the farm and help the farmers with the apple-picking if it ________ tomorrow.

This sentence is too hard ______ me ______ understand.[ ]

What’s on the desk? —There ______ a pen, a book and two keys.

Let’s go fishing if it _____ this weekend.—But nobody knows if it _______.

Is this ruler Mary’s?——No, it _______Mary’s. Hers is on the desk..