Read the text. Then choose the correct answer for questions 31-32

Read the text. Then choose the correct answer for questions 31-32.
If you are staying in London for a while, it is usually best to buy a weekly or monthly pass. (You will need a passport size photograph.) If you want to travel a lot around the London area at weekends or after 9.30 am during the week, buy a one- day travel card from a railway station. Yon can use it on the railway, underground and bus system.

When there are three or four of you then it is worth taking a taxi. It will still be a bit more expensive than public transport (and the driver will expect a 10-15% tip) but it can save a great deal of time and frustration.

Finally, it is worth thinking of using the river as a way of getting from A to В instead of just as a pleasure trip.
31.What is the main idea of the text?

1. 
   The cheapest way to travel in the city is with a pass.
   
2. 
   One-day travel card allows you to use all types of transport in London.
   
3. 
   Different types of transport are available in London.
   
4. 
   Taxi is the best way of travelling around the city.
   

32.According to the text, what does the word “tip” mean?

1. 
   A small amount of extra money
   
2. 
   An untidy place
   
3. 
   The thin pointed end of something
   
4. 
   A small piece of advice