We all sighed with ________ relief when ________ plane finally landed safely.
| A．a; / | B．/; the |
| C．a; a | D．a; the |
_____by a greater demand for vegetables, farmers have built more green houses.
| A．Driven | B．Being driven | C．to drive | D．Having driven |
The manager demanded that the task ______ within a week.
| A．must complete | B．would be completed |
| C．be completed | D．must be completed |
--Have you got any particular plans for the coming holiday?
-- Yes. ______, I’m going to visit the Palace Museum.
| A．If necessary | B．If possible | C．If any | D．If ever |
We’ll talk about some cases_______ drivers obviously knew the traffic rules but didn’t obey them.
| A．where | B．whose | C．which | D．that |
In such a fierce competition, a person has to make every effort if he_______.
| A．has succeeded | B．would succeed | C．will succeed | D．is to succeed |