The information ________ light upon the mystery of Dr．Baker．

laid

threw

fixed

focused

The teacher asked her to ________ her article to under 1000 words．

cut in

cut up

cut down

cut out

Water, ________ seems so simple and common, is ________ makes life possible．

what, which

which, what

in which, that

that, in which

Water can absorb and ________ a lot of heat without big changes in temperature．

give away

give off

give up

give in

Density is the relationship between mass and volume and is measured ________ kilogrammes per cubic meter．

at

by

for

in

Life in the oceans ________ from the tiniest plankton all the way up to giants like sharks and whales．

differs

ranges

varies

changes

The nutrients in ________ falls into the ocean quickly become available to other living creatures．

which

whatever

anything

no matter what

The 18^th and 19^th centuries ________ the widespread use of electricity and the birth of the steam engine．

made

proved

spared

witnessed

Tourism of our city has a bad ________ on the wildlife．

affect

effect

afford

effort

You ________ try to get there a bit early．If you are late, you ________ not find a seat．

have to, can

can, may

need, must

should, will