1 The police came to ______investigate __________________ the murder immediately.
2 I still have__________research______________ to do for my project on sharks.
3 I must__________look for ______________ this word in the dictionary, because I don’t remember what it means.
4 Mum, I’m __________lookup ______________ my trainers. Have you seen them?
5 As soon as the five friends got to the cave, they decided to __________explore______________ it.