Although at present human egg cells and embryos needed for cloning research are difficult _____, Newspapers _________ evil leaders hoping to clone themselves.
As we know, _______ medical examination will help us find out health problems as early as possible.
Some exercises appear to be ______ ones you have done, but on ______ second thoughts, you’ll find that they’re different.
. —Thank you for having bought me a ticket for the World Expo in Shanghai! — ________.
.—Did he _______ to escape being punished by the police? —No, he _______ to, but failed.
._______ in the leg, the soldier was sent to hospital.