Why not ____ help when you were in trouble

I’m very worried because I have made ________________ progress in my math.

19. To work at home has been made _____ with the development of the Internet.

Heads from different countries gathered in Amsterdam and President Xi jinping _____ a speech on nuclear safety

This history book is of great value.–Exactly. However, ____can be enjoyed from it _____you have a deep understanding of it.