There are some health problems that, when ____ in time, can become bigger ones later on.
| A．not treated | B．not being treated |
| C．not to be treated | D．not having been treated |
In this park , sparrows often fly down from trees to eat from visitors’hands. They are used to in this way .
| A．be fed | B．feed | C．having fed | D．being fed |
They started off at about 5 o’clock in the morning . They should there by now .
| A．arrive | B．have been arriving | C．have arrived | D．be arriving |
Have you ever been to the square was built last year?
| A．which | B．where | C．when | D．what |
You don’t have to pay for your flights ; they’re in the price of your holiday .
| A．concluded | B．held | C．settled | D．included |
He thought nobody was around , but he was in fact seen into the office building .
| A．to steal | B．steal | C．stole | D．stolen |