A (A) large portion of the world's (B) water supply have been (C) contaminated by factory waste, ships and oil spills. (D)
A.A
B.world's
C.have been
D.spills

Jack will win the (A) election if (B) he campaigned (C) harder. (D)
A.the
B.if
C.campaigned
D.harder

If someone .................... into the store, smile and say, 'May I help you?'
A.comes
B.came
C.will come
D.would come

We wondered why....................... a tip.
A.to leave
B.should we leave
C.we should leave
D.don't we leave

A.gulf
B.surface
C.submarine
D.current

A.poor
B.tour
C.actual
D.group

A.tiny
B.device
C.krill
D.migrate

A.investigate
B.information
C.submarine
D.independent

A.carnivore
B.entrapment
C.technology
D.Atlantic

Whales feed on krill.
A.tiny shellfish
B.small fish
C.sea plants
D.small animals