Complete the sentences below, using the modals provided in the box: (can't/could/might/must/mustn't/need/needn't/should/will/would)

Here are the completed sentences using the appropriate modals:

1. I should have gone to the doctor, but it got better.

   • "Should have gone" indicates that going to the doctor was advisable, but the action was not taken because the situation improved.

2. If you speak to her, she would probably tell you the truth.

   • "Would" is used here to express a probable outcome in a conditional sentence.

3. The company boss must be extremely rich if he owns several sports cars.

   • "Must" is used to express a strong logical deduction based on the evidence provided.

4. I needn't have got up so early but it was a sunny day and I was planning to.

   • "Needn't have got up" means that getting up early was not necessary, but the action was performed anyway. The "but" clause explains why the early rise was still a good idea.

5. Jack didn't need to explain the situation. Everyone knew what was happening.

   • "Didn't need to" expresses a lack of necessity for an action, implying the action was not performed.

Here are the completed sentences:

1. I $\boxed{\text{should}}$ have gone to the doctor, but it got better.
2. If you speak to her, she $\boxed{\text{would}}$ probably tell you the truth.
3. The company boss $\boxed{\text{must}}$ be extremely rich if he owns several sports cars.
4. I $\boxed{\text{needn't}}$ have got up so early but it was a sunny day and I was planning to.
5. Jack didn't $\boxed{\text{need}}$ to explain the situation. Everyone knew what was happening.