The system has been designed to give students quick and easy ________to the digital resources of the library.
—We ______ that you would fix the TV set this week. —I’m sorry. I ______ to fix it this week, but I’ve been too busy.
______time went on, the people in the area came to realize how serious the environment had been polluted.
I didn’t manage to do it______you explained how.
.Don’t stop______you meet with a word you don’t understand.
Don’t be afraid of asking for help ______it is needed.