Choose the correct phrase to complete the sentence.

1 There are many ... with nanotechnology.
2 Doctors can often remove ... from patients.
3 What was once only read in ... is now a reality.
4 Scientists are hoping to improve methods of ... .
5 Cars with better ... are better for the environment.
6 A ... is something in the body that shouldn’t be there.
7 Some scientific theories suggest that this may reduce ... .
8 The craftsmen use ... such as wood and stone.
9 We are hoping to prevent an ... .
10 Scientists must use ... with this new technology.
11 Skin is a ... against infection in the body.
12 ... cover our cells and help protect them.