If you ...... (consume) too much sugar, your blood pressure ...... (rise).

If two stars or planets ...... (collide), there ...... (be) an explosion.

If you ...... (put) wood on fire, it ...... (start) burning.

If you ...... (throw) wood on water, it ...... (float).

If a strong wind ...... (blow) and the temperature ...... (drop), a storm ...... (be) sure to follow.

If you ...... (disconnect) two cables, the TV or radio set ...... (have) no more reception.

If a bird ...... (have) only one wing, it ...... (not / fly).

If a wild beast ...... (be) hungry, it ...... (attack) anybody.

If animals ...... (live) close to people's houses, they ...... (lose) fear of man.

If you ...... (wear) light clothes in severe winter conditions, you ...... (be) likely to catch cold or even worse.

Iron ...... (rust) if it ...... (get) wet.

If you ...... (not / feed) your dogs, they ...... (die) eventually.

If it ...... (not / rain), the grass ...... (be) not green.

Ice ...... (melt) if you ...... (heat) it.

If you ...... (multiply) six and ten, you ...... (get) sixty.