States which lack water supplies are often desperate for help.

A) which

B) lacks

C) often

D) are

I was in the backyard when Jack shouted for help.

A) help

B) I

C) was

D) when

It is important to consider the ecological effects of any diversion of water.

A) It

B) is

C) effects

D) any

The tree was cut down in a single blow by the wood cutter.

A) by

B) the

C) in

D) was

The child looks happy about receiving the gold medal.

A) about

B) looks

C) the

D) receiving