5. Read the following text and choose the best answer from A to F below to fill in each of the gaps in the text.

　　1) Unfortunately it is also one of the most polluting.

　　2) The European Union already restricts emissions from cement kilns, and other jurisdictions are likely to follow suit.

　　3) In 2006, for example, Holcim's emissions per tonne were 16% below the level of 1990.

　　4) The cuts come in three main areas.

　　5) But all three tactics have their limits.

　　6) Holcim's total emissions, for example, have risen by two-thirds since 1990.