1. ............ if a planet life the Earth existed.
2. ........... because they help us speed the copying process.
3. ........... so that violence among children has risen in the past few years.
4. ........... although it doesn't work for deaf people.
5. ........... which means different behaviors are being displayed.
6. ........... as well as he could.
7. ........... than he did last year.
8. ........... so that the selection process would speed up.
