Here are the correct tenses of the verbs for each sentence:

1. The old computer (repair) **is going to be repaired** tomorrow.
2. There is no milk left. - Really? I (get) **will get** some from the store.
3. As planned, I (stay) **will stay** with my relatives in my hometown next summer.
4. Sandwiches (eat) **are being eaten** by Paine at the moment.
5. I hope I (get) **will get** along with everyone.