When I try to find ______that prevent so many people from taking part in the program, it seems to me that there are two main causes.
Finally the English government tried in the early twentieth century to form the UK by getting Ireland __________ in the same peaceful way.
The bridge built ten years ago __________ the island __________ the mainland.
The bus __________ passengers outside the airport.
—Is the dentist at work? —I'm sorry to tell you he is on __________.
—Peter's rarely ill,__________ he? —__________. He is quite healthy.