Forming compound words

<http://www.flo-joe.co.uk/cae/students/strategy/wform/compound.htm>

2. (MOUTH)He tried to disguise his voice whilst talking on the telephone by putting a handkerchief across the .......... (the part of the phone that you speak into).
--> mouthpiece

3. (CHAIR)The meeting will be introduced by the .......... (somebody who runs a meeting).
--> chairman (my answer) , chairwomen, chairperson

4. (PEAK)If you can catch your train during .......... (when it is not so busy) times, your ticket will be much cheaper and the trains less busy.
--> off-peak

5. (NARROW)She is very .......... (unwilling to accept new ideas) when it comes to people from different cultures.
--> narrow-mimded

6. (WORK)The teacher gave us a list of phrasal verbs to revise for .......... (extra work that a student does) tonight before our test tomorrow.
--> overwork--> homework

7. (DAY)He's been watching a lot of .......... (during the morning and afternoon) since he lost his job.
--> whole-day--> daytime

8. (SENTENCE)Somebody from the audience shouted out, and the speaker was forced to stop in ......... (in the middle of).
--> mid-sentence

This exercise is vey difficult to me. I am absolutely impossible to finish. Practice more!