Although the first part is easy, the rest ______.
| A．is supported difficult | B．are difficult |
| C．has proved difficult | D．could have been difficult |
______ of danger in the street at night, she had to go home with a friend ____ her.
| A．Warning; following | B．Having warned; following |
| C．Warned; followed | D．Having been warned; following |
.The company ______ a survey to find out customers’ reaction to the new products.
| A．concerned | B．conducted | C．predicted | D．previewed |
Edwards's always chasing after rainbows and never ____ a really practical idea.
| A．coms up with | B．look forward to |
| C．catches up with | D．comes over to |
______ careful you are, ______ mistakes you will make.
| A．The less; the better | B．The more; the fewer |
| C．The fewer; the richer | D．The more ; the poorer |
.People in developed countries are supposed ______ more healthy food before than what they have today.
| A．to be had | B．to have | C．had | D．to have had |