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Let’s go through each sentence one by one. We need to decide whether to use the gerund (verb + ing) or the infinitive (to + verb). Sometimes both are possible, but we’ll pick the most natural or correct form based on common usage.

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1. ______ is really good fun. (fly)
→ “Flying” sounds better here — it’s a general activity. Gerunds often act as subjects.
✔ Flying

2. We stopped at the motorway services ______ some food. (get / eat)
→ After “stopped”, if you mean you paused in order to do something, use infinitive: “to get” or “to eat”. Since it says “some food”, probably “to get” makes more sense. But “to eat” also works. Let’s pick “to get” because you stop to get food first, then eat it later.
✔ to get

3. What’s this for? It’s for ______ vegetables. (cook)
→ After “for”, we usually use gerund. “For cooking” = purpose.
✔ cooking

4. I can’t get used to ______ before the dawn. (get up)
→ “Get used to” is followed by gerund. So: “getting up”
✔ getting up

5. I’m sorry about ______ you. (not invite)
→ After “about”, use gerund. Negative gerund: “not inviting”
✔ not inviting

6. There’s a lot of work ______ on the new building. (do)
→ This is passive meaning — work that needs to be done. Use infinitive: “to do”
✔ to do

7. I really love ______ with the children. (play)
→ After “love”, both gerund and infinitive work, but gerund is more common for general enjoyment.
✔ playing

8. ______ is a good form of exercise. (swim)
→ Subject of sentence → gerund
✔ Swimming

9. There are some interesting things ______ in the museum. (see)
→ Things that you can see → infinitive for possibility/purpose
✔ to see

10. You’re lucky you haven’t got a child ______ (look after)
→ Child who needs looking after → infinitive for purpose/need
✔ to look after

11. We managed ______ the exam by ______ each evening. (pass / test)
→ “Managed” is followed by infinitive: “to pass”
→ “By” is followed by gerund: “testing”
✔ to pass, testing

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Final Answer:
1. Flying
2. to get
3. cooking
4. getting up
5. not inviting
6. to do
7. playing
8. Swimming
9. to see
10. to look after
11. to pass, testing