. —I'd love to join your visit to a local museum today, but I'm on a very tight ________．—I've got a lot of work to do today.

______ there are living creatures in the outer space as those on Earth hasn’t been proved so far.

The point is that the new, the different, is almost by __________ scary.

I believe that human cloning is wrong. If we toy with nature, we will have to deal with the _______.

The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.