Give the correct form or tense of the verbs in brackets.
1. This was the second time I (eat) ____________________ this kind of food.
2. It’s advisable that he (arrive) ___________________ before seven.
3. His book fell into the river and (lose) __________________ forever.
4. It was our fault to keep you waiting so long. We (inform)_____________________ you in advance.
5. I don’t know what the matter with him is. He has been acting funny since you (be) ________________away.
1 have eaten
2 arrive
3 lost
4 should have informed
5 were