Use the verbs in brackets in Present Simple.

People (call) the camel “the ship of desert” that can carry a traveller from one place to another quickly and safely. The camel’s humps (hold) fat, and it (give) the camel strength where it (have) not got food or water.

The horse (carry) the man, the cow (give) him milk, and the sheep (give) him wool. But to the people of deserts the camel (be) the horse, the cow and the sheep, all in one. The camel (help) the farmers with their work on the land. The camel (give) them milk, and they (make) camel’s milk into butter and cheese. The people of deserts (eat) the camel’s flesh, and its hair (give) them wool for clothes.

Правильные формы глаголов в Present Simple:

People call the camel “the ship of desert” that can carry a traveller from one place to another quickly and safely. The camel’s humps hold fat, and it gives the camel strength where it has not got food or water.

The horse carries the man, the cow gives him milk, and the sheep gives him wool. But to the people of deserts the camel is the horse, the cow and the sheep, all in one. The camel helps the farmers with their work on the land. The camel gives them milk, and they make camel’s milk into butter and cheese. The people of deserts eat the camel’s flesh, and its hair gives them wool for clothes.

Здесь формы с окончанием -s употребляются с существительными в единственном числе: the camel gives, the horse carries, its hair gives. С существительными во множественном числе используется начальная форма глагола: people call, humps hold, they make, people eat.