A swimmer should________before diving with a snorkel.

it is extremely dangerous

many people who do it suffer from oxygen shortage

you have to buy special clothes in order to do it

most swimmers can learn to do it

to protect their feet cut from sharp rocks

to protect them from the rays of the sun

in order not to become infected

in order not to lack oxygen

You will not be able to dive deeply enough.

You will not be able to float properly.

You will use up too much oxygen.

You will lose consciousness.

doing it in tropical seas                 

explaining the technique to a beginner

describing how exciting it can be   

doing it for the first time

doing it in tropical seas                 

explaining the technique to a beginner

describing how exciting it can be   

doing it for the first time

doing it in tropical seas                 

explaining the technique to a beginner

describing how exciting it can be   

doing it for the first time