Many plants and animal species are now on the _______ of extinction.

After a momentary _________ of concentration, Simon managed to regain his focus and completed the test.

The _________ prices of property in big cities may deter people on low incomes from owning a house there.

Two students are talking about the school curriculum.

- Ted: “Swimming should be made part of the school curriculum.”

- Kate: “________. It is an essential life skill.”

Many parents tend to make their children study hard in the belief that good education will enable them to _________ in the future. 

We arranged to meet at the station, but she didn’t _______.

Everything is ________ you. I cannot make ________ my mind yet.

Our professor _______ said we should turn in the assignment on Friday.