Probably the most important skill for task 1 is to be able to describe numbers correctly. Look at the table below.
It's useful to think about how to start your sentences. For example, here are some sentences about the year 1970:
1) 60 million tonnes of goods were transported by road.
2) The amount of goods transported by road totalled 60 million tonnes.
3) Road vehicles were used to transport 60 million tonnes of goods.
You should notice that it's much easier to begin with the number (sentence 1). This is how I usually prefer to write sentences for task 1.
Number 2 is good, but you might find that you repeat "the amount of goods" too many times if you only use this type of sentence.
Number 3 is the most difficult. You can't say "Road was used", so you have to add the word "vehicles". Most students make a mistake here.