He devoted himself _______ to his research and got many achievements.

The charity sale our school organizes every year has taught us much that we would never have _____ learned in class.

.Computers and mobile phones, playgh they are indeed making our life________and more________have reduced the need for face-to-face cotyr unication.

In my opinion, she is too young to take care of the pet dog ______.

On this happy occasion, I'd like to say that we are _____ much obliged to you for your kind cooperation.