So difficult __________ it to work out the problem that I decided to ask Tom for advice.
| A．I did find | B．did I find |
| C．I have found | D．have I found |
This is a very special flower and it can ________ a strong sweet perfume(香味) at night.
| A．give in | B．give up | C．give out | D．give away |
______ we know, the air quality in the city has improved over the past two years.
| A．That | B．As | C．What | D．It |
We sometimes have to meet some difficulties, but we should develop a good attitude _______ life.
| A．in | B．on | C．at | D．to |
_______ never to come back, the boy left his home angrily.
| A．Determined | B．Determining | C．Being determined | D．Determine |
When my grandfather retired(退休) at the age of 60, he took a sea ________ around the world, which had been his dream since his childhood.
| A．travel | B．trip | C．voyage | D．journey |