When you are home,give a call to let me know yousafely.
are arriving
have arrived
had arrived
will arrive
People are puzzled _____ they read the book.
We have done things we ought not to have done and_____ undone things we ought to have done.
When you write to him, please _____ him.
-- Tom works hard at English.?-- _____, and _____.
After he gave a report about the school, Mr White____ the visitors around it.