If tomorrow______________ fine, we’ll grow the flowers.

Doing exercise for_____ hour every day is good for your _____ uncle.

Hey, Jack. You ________ on the phone just now. But you weren’t here and the man left a phone number. —Oh? I was in the library.

Look! ________an eraser．

We must try our best to stop pollution ______ a low-carbon(低碳)life.