作业4：Fill in the blanks with the expressions given below. Change the forms where necessary.
even if at firstworry about grow upmake a difference to
make friends withkeep up with track down set the stage for
at one’s besthappen toadjust… to
1. If you don’t succeed, try, try again.
2. The boy said that he wanted to be a computer scientist（科学家） when he .
.
3. Today young people from different countries can easilyone another through email.
4. Everything is developing（发展） so quickly in today’s world that I am afraid I can’t all the changes.
5. Did you hear whatDavid last night?
6. Tom spent an hour in the library and finally the bookhe wanted.
7. I wouldn’t lose courageI should fail ten times.
8. Exercise can to your state of health.
9. This weekend’s talks between the two leaders have a peace agreement to be reached.
10. If you feel cold, you canthe temperature in the room your taste.
11. Most athletes are during their youth.
12. Your parents you: do write to them.