Read the text below. For each empty space (1-12) choose the correct answer (А, В, C or D). All rocks are mixtures of tiny grains called minerals. (1) minerals are soft and light, (2) are hard and dark. Gold and iron are types of minerals, called metals, that (3) rocks. Diamonds and the opal are rare minerals, called gems.
The grand canyon in Arizona (4) up of many layers of rock that (5) away by water. One of the main kinds of rock in the canyon is sandstone, which (6) sand and (7) pieces of rock. It can be cut and shaped easily, so it (8) for building.
Most fossils are (9) of ancient animals and plants that (10) in rock over millions of years and turned to stone. Sometimes fossils are the signs (11) by animals, (12) footprints, burrows or droppings.

A В C D
1 Something Any Some Several
2 other another different others
3 found are found have been found were found
4 is made made was made were made
5 have been worn worn was worn has been worn
6 made of is made of was made up made up
7 some others other another
8 often used often is used is used often is often used
9 the remains remains the remain remain
10 hardened has hardened have been hardened have hardened
11 left left behind were left were left behind
12 such so as such as as