It’s really difficult to ______ what he is trying to express.

Looking out of the window, I saw the leaves        by the wind and whirled into the air.

I firmly believe, as long as I      great efforts, my dream will come true sooner or later.

Scientists _______ a lot of experiments on animals, hoping to find and effective way to cure the patients who had AIDS.

Putting in a new window will ______ cutting away part of the roof.

I always _____ on life when listening to Beethoven’s symphony.

—I’m fed up with this rain. How I wish to go hiking this weekend!
—Forget it. I’m afraid the wet days will _____.

Our parents and teachers often ________ the importance of study hard _______ us.

Sitting alone by the window, all the memories __________ .

The other day, when I was wandering in the street I ________ one of my old friend, Jim.