1 When you do the experiments,you should follow your teacher's (instructions).
2.If you want to get good mark,you should write the words (correctly).
3.They went on a long train journey across (India).
4.My parents don't have time (to check) my homework.
5.The poor man lost his two (sons) in the war.
6.The building has enough space (to park) your cars,but you must pay 30 yuan for each.