--- I haven’t got a mobile phone. --- I think you should have ______. It’s useful for you.
________, you'll never be able to persuade him.
Experts have found that the disease will lead to a greater increase in the number of sufferers unless ________ seriously when the symptom first appears.
What shall we use for power when all the oil in the world has ________?
Cloning humans has been _____ in the science world for many years and it is likely to continue .
—You have to believe in yourself. No one else will, if you don’t. —_______. Confidence is really important.