You needn’t have apologized for your absence—       , it’s hardly your fault.

It’s always difficult being in a foreign country, ___________if you can’t speak the language.

As is known to all language learners, the newly learnt words will soon be forgotten unless they are _______ used in everyday communication.

(2013·沈阳二中模拟)She devoted herself________to her research and it earned her a good reputation in her field.

Process so far has been very good．______，we are sure that the project will be completed on time．