1. I can't come out tonight because I have too much (job) work.
Job is uncountable and refers to a specific profession. Work is uncountable and describes the general activity.
2. What (means) does this word mean?
This is an object question, so you need to use the auxiliary verb.
3. People in Manchester (is) are very friendly.
People are countable.
4. I felt so (tiring) tired when I got home last night.
Adjectives ending in -ed describe how you feel, those ending in -ing describe the things that make us feel that way.
5. Our plans for the weekend depend (of) on the weather.
To depend is followed by the preposition on.
6. (The parents of her boyfriend) Her boyfriend's parents are visiting next week.
Use the possessive apostrophe here.
7. I found all the information (in) on the Internet.
We find things on the Internet.
8. I don't have (many) much time this weekend.
Time is uncountable here.
9. Can you give me some informations about the course?
Information is uncountable.
10. His car is similar (than) to mine.
Similar to, bigger than, as big as.