Please remember _______ the plants while I’m away.
The ground is slippery. Hold on to the rope and don’t ______.
Only when the war was over ______ to his hometown.
I found ______ flowers on my way to the countryside last weekend.
I first met Mr. Smith in America. He ______ at Stanford University then.
To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.