-Can you follow me?-Sorry, I can _____ follow you. You speak too fast.
Since June 1 2008,all the markets have_________free plastic bags.
---Have you seen Dr. Adams recently?---No. He __________ Hong Kong for an important meeting. He’ll come back tomorrow.
-- Has your sister come back? --Yes, she has. She______ back two days ago.
There __________great changes in our hometown in the past fifteen years.
-----________did your uncle leave his home town ?----He ___________for nearly twenty years.