Mary broke up with me!—You_ _have forgotten about the Valentine’s Day．

The man walked so fast that the child couldn’t ___ him.

40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.

Sam _______some knowledge of the computer just by watching others working on it.

What’s wrong with your pen?– The ink ___________ come out.