Samuel Clemens,______ Mark Twain, wrote many popular stories.
The number of people who ____English as a foreign language __more than 750 million.
He is really considering ___himself to ___these children of the poor mountain village.
--I’m sorry I didn’t make it to your party last night. -- ______, I know you’re busy these days.
There is no doubt that IT plays___important role as a new teaching tool in this era of___technology.
Although this medicine can cure you ______ your illness, it has a bad effect ______ you.