It’s not easy to learn a foreign language, but I will never _______.

It’s really stupid of you ____ him the newsyesterday so that it has been disturbing him all the time．

I was so familiar with him that I recognized his voice I pick up the phone.

The factory produces half a million pairs of shoes every year,80%________ are sold abroad.

Students ___________ remain in their seats until allthe papers have been collected