1.Arduous= extremely difficult and involving a lot of effort

E.g. The journey was long and arduous.

2. Falling short

Meet sb's expectations

E.g. While most students were meeting or exceeding their parents' expectations, many still thought they were falling short.

3. Comprehensive coverage

E.g. The impression is that the logical nature of textbooks and their comprehensive coverage of different types of example renders work sheets unnecessary.

4. Render= 01 FORMAL to provide a service, or to give help to someone or something

E.g. We are sincerely grateful to everyone who has rendered assistance to the victims of the earthquake.

E.g. for services rendered: He received payment for services rendered.

02 FORMAL to express, show, or perform something in a particular way

E.g. The power of the sea was beautifully rendered in the poem.