Mr. Lin’s comments were very difficult to follow because they were ______related to the topic under discussion.

In my daily life I      ignore work , study , and other activities to check my phone for messages.

By working slowly but surely towards your goal, you’ll _____ succeed.

A model or an experiment in a science class can help us see things which would       remain hidden．

I spent several years in France, ______ I never learnt to speak French．