Women _______ drink more than two cups of coffee a day have a greater chance of having heart disease than those _______ don’t.
Mrs Mavis said the aliens took her away so that they could do research _______ her.
Mr Smith will not be able to attend his sons wedding ceremony, because he_______ an important speech.
---The police have been______ the area for quite a long time. ---I’ve also noticed that. What have they been______?
Then, a few months after Carter had opened the tomb, Lord Carnarvon_______ ill with a fever and died in Egypt.
Hiking is _________ great fun. You will get close to________ nature and take exercise at the same time.