Complete the following passage with suitable verbs from the box. Put them in the correct tense. Use the negatives where necessary.

lose	protect	ride	become	need
discover	travel	be	provide	make

Men (a) ______ ever since they first appeared on the earth. In primitive time, they did not travel for pleasure but to find new places. They (b) _______  themselves with simple weapons. Their journeys (c) ______ long tiring and often dangerous. Being intelligent, they soon (d) _____ easier ways of travelling. They (e) ______ on the backs of their domestic animals. They (f) _______ boat and used it to travel across water. Travelling, of course, has now (g) _____ I highly organized business. There are vehicles which (h) _____ us with comforts and security. If we want to go abroad, we (i) _______ a passport and a visa. If we (j) ______ any of them, our journey may be ruined.