---- What do you think of the book? ---- Oh, excellent .It is worth __________ a second time.
If you _______nature and do things at the wrong time of year, you will have to do more work and the results will not be so good.
If you don’t agree to our plan, __________.
How much do you ________ for repairing my CD player?
Follow your doctor’s advice, ______ you’ll get well soon.
A study shows that people _____ get medical advice from the Web actually get worse.