Silk, a natural ______, has been prized for its beauty and comfort.

• textile

• plant fiber

• silkworm

• thread

The silkworm is a kind of ______ that produces silk.

• plant fiber

• fiber

• larva

• inheritance

The sentence "Silk, a natural fibre ______ by a worm, is very valuable" is an example of a:

• is produced

• which produced

• produced

• is produced

Silk was once ______ for use by the emperor only.

• calculated

• reward

• reserved

• stopped

He is the heir to the ______ and will become king one day.

• dragon

• silk

• throne

• plant fiber

The use of silk spread ______ throughout Chinese society.

• quickly

• gradually

• eventually

• previously

Today, silk is a ______ material used for clothing and decoration.

• da

• seal

• dramatic

• common

The monks managed to ______ the secret of silk-making for centuries.

• reward

• search for

• seal

• stop

Cotton and silk are two examples of ______ used in the textile industry.

• currency

• plant fibers

• economy

• heirs

After years of effort, the truth was ______ proven.

• dramatic

• previously

• eventually

• usually