Structure 1

The ponderosa pine is _____ of the most of the timber used by forest- product firms in the Black Hills of South Dakota.

• the source

• as source

• because source which

• because the source which

Computers that once took up entire rooms are now _____ to put on desktops and into wristwatches.

• small enough

• smaller than

• so small

• as small as

According to some educators, the goal of teaching is to help students learn what _____ to know to live a well-adjusted and successful life.

• do they need

• they need

• they are needed

• as they need

The sapphire’s transparency to ultraviolet and infrared radiation makes _____ in optical instruments.

• it is of use

• it uses

• it a useful

• it useful

_____ initial recognition while still quite young.

• Most famous scientists achieve

• That most famous scientists achieved

• Most famous scientists who acheived

• For most famous scientists to achieve

Mango trees, _____ densely covered with glossy leaves and bear small fragrant flowers, grow rapidly and can attain heights of up to 90 feet.

• whose

• which are

• are when

• which

_____ the Canadian composer Barbara Pentland wrote four symphonies, three concertos, and an opera, among other works.

• an artist who, prolific

• is a prolific artist

• prolific an artist

• a prolific artist,