Read the sentences and choose the correct options to fill in the gaps.
1. - Dan remembers (to hear / hearing) that melody the first time he met Cathy.
- Please remember (to buy / buying) the ingredients I need for cooking a new dish.
1) to hear
2) buying
3) hearing
4) to buy
2. - Don't forget (to listen / listening) to that song.
- You'll love it! We'll never forget (to go / going) to the first trip to Europe.
1) going
2) to go
3) listening
4) to listen
3. - We don't need (to return / returning) Ben his books. He's already got them.
- This electronic device is out of order. I think the batteries need (to change / changing).
1) to return
2) changing
3) to change
4) returning
4. - Dad tried (to watch/ watching) the film but fell asleep.
- Students tried (to hear / hearing) all the words in the radio show, but they couldn't.
1) hearing
2) to watch
3) watching
4) to hear