GRAMMAR DIMENSIONS 3 UNITS 2 13 15 20 21 22

The widespread use of oil and gas to make chemicals ________ during the 1920s.

• has begun
• began
• were beginning
• begun

Astronomers studied the 1987 Supernova to learn __________ when a star explodes. 

• what happens
• that happens
• that does happen
• what does happen

Although there are 92 elements occurring naturally on the earth, there are also a _________ elements which have been synthesized in laboratories. 

• littele
• few
• great deal of
• bit of

When countries found that there was not __________ gold left in their reserves, they had to abandon the systems where the value of money was based on that of gold. 

• many
• lots
• much
• a lot of

Georgia should be granted visa exemption as soon as they __________ all technical criteria

• will meet
• met 
• will have met
• have met

By the time swine flu ________ on the radar screen of global public health, we _____________ the ability to contain it.

• reaches / loses
• had reached / will be lost
• will reach / will lose
• have reached / will have lost

While Adidas ___________________ a new idea to increase the quality of their waterproof shoes next week, Nike ____________ to release a line of Marty McFly’s self-lacing sneakers.  

• will introduce / plans
• will be introducing / will plan
• is introducing / is planning 
• introduces / will have planned

These freshwater Bala sharks generally ___________ most types of fish food including vitamin enriched flake foods, frozen, freeze dried and definitely live foods with the key being a varied diet.

• eats 
• have eaten
• will eat
• going to

Happy are ___________ who dare courageously to defend what they love.

• these
• those
• that
• this

Why a person has __________ friendships is something that cannot be adequately determined by a survey. 

• no
• not
• none
• neither