— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear ! She ______ a lot of difficulties !
A brilliant idea occurred to him, ______ to his research in the lab.
_____ it would be silly to argue any longer .
Did ______ on time make the teacher angry ?
You can hardly imagine the difficulty the woman had ______ her children.
Only one of the places is ________