When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
| A．refers to | B．related to | C．comes to | D．talks to |
If I have any further news, you will be the first person_____.
| A．to know | B．known |
| C．knowing | D．knew |
The boy student is poor in health now; his parents wish that his health _____when he grows up
| A．can improve | B．could improve |
| C．can be improved | D．could be improving |
—Which of the two computer games did you prefer?
—Actually I didn’t like .
| A．both of them | B．either of them |
| C．none of them | D．neither of them |
—I’m going to Thailand this summer holiday.
—
| A．Take care! | B．Write to me. |
| C．Have a nice trip! | D．When will you come back? |
She always come to our help when we get into trouble ____ she is very busy.
| A．since | B．once |
| C．even if | D．so that |