Over the years the European Union has made great efforts to _______ the safety of food and protect the health of its people.
| A．discover | B．ensure | C．revise | D．react |
In my opinion，life in the twenty－first century is much easier than ________.
| A．that used to be | B．it is used to |
| C．it was used to | D．it used to be |
When I handed the report to John，he said that George was the person ________.
| A．to send | B．for sending it |
| C．to send it to | D．for sending it to |
It is said in Australia there is more land than the government knows ________.
| A．it what to do with | B．what to do it with |
| C．what to do with it | D．to do what with it |
I like getting up very early in summer.The morning air is so good ________.
| A．to be breathed | B．to breathe |
| C．breathing | D．being breathed |
—Is Bob still performing?
—I'm afraid not.He is said ________ the stage already as he has become an official.
| A．to have left | B．to leave |
| C．to have been left | D．to be left |