I'm very confused and my teacher is bad at explaining so i need with the answers.

I did what i could so here it is...I hope this helps. 
2. Had should be underlined once and completed should be underlined twice
4. Eventually should be underlined once and became should be underlined twice.
5. Was should be underlined once and invited should be underlined twice.
7. Outstanding should be underlined once and efforts should be underlined twice. 
8. Could should be underlined once and continue should be underlined twice.
9. Was should be underlined once and observer should be underlined twice.
10. Remained should be underlined once and interested should be underlined twice. 

If two person had given your answer then there is a option of mark as brainliest. click there in the option of mark as brainliest in which you like the answer most. if any one person has given answer then after some days you will a notification to mark his/her answer as brainliest.