4) 1. falling

2. to lock

3. to buy

4. doing

5. seing

6. to bring

7. taking

8. to finish

9. studying

5) 1. to feed, to do

2. give, to take

3. watching, watching

4. trying, to be

5. reach, using

6. to tell, to go out

7. to do, go

8. talking, to listen

9. to help, collecting

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