—How was the journey?—Tiring! I caught the train at the last second but all the seats _____.I stood all the way.
Once you ______ the habit of smoking, it is hard to quit.
It's high time that you ________ even harder at your lessons as the exam is around the corner.
The center, dealing with children_______ to computer games, has achieved great success.
—How I wish I had studied harder when I was in senior school! —If you had,you ________ a university student now.
With so much work on hand, you _____ to see the game last night.