Choose the correct option to complete each sentence.

1 I can’t make any sense with / of / in this text. There are a lot of difficult words.
2 I don’t think students should have access for / in / to the Internet during tests.
3 For me, it’s difficult to concentrate to / on / at one subject for a long time.
4 Our teacher told us to learn the irregular verbs in English by / for / with heart.