Selecting a mobile phone for personal use is not an easy task because technology ________ so rapidly.

Now that she is out of a job, Lucy _____ going back to school, but she hasn’t decided yet. 

(2014·日照模拟)For years the government of that country________their responsibility when it comes to the mentally ill.

Pardon? I ___ quite catch you.

Since then the number of people taking driving lessons ________ 20％.