In order to find out how the famous painting was stolen as soon as possible, more experienced policemen have been sent to _____ the case.
In my opinion, you can widen the _____ of these improvements through your active participation.
While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.
The lawyer was expected to _____ some proposals after reading all those documents.
_____ his knowledge of the mountainous country, John Smith was appointed as our guide.
Political parties often differ in their views on various _____ concerning their own countries.