He was __ with the results of the exam, which can be seen from his __ smile.

They have_______ carefully the time and money needed to complete the project.

We are always told that only through hard workour goals in our study.

It’s said that ______of the water around the world___ polluted.

Television has many advantages．It keeps us ____ of the latest news and also provides entertainment in the house．_______ it’s so popular worldwide.