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2) Complete the following sentences.
1) They can be found ...
2) The properties can change ...
3) How can we develop…?
4) As an engineer, you might work on …
5) It may surprise you to learn that …
6) Ecology can be broadly defined as …
7) We need to find a better way to …
8) We’ll be allowed to…
9) Their source can include …
10) May I use …
11) … must be minimized…
12) ... is to be prevented ...
13) There are some metals that can be only....
14) They should pay more attention to...