| A | B |
|---|
| cavity | hole in a tooth |
| dentist | doctor who cleans and repairs teeth |
| filling | metal or other material used to fill a cavity |
| invader | person who enters a country by force to attack it or to steal |
| invasion | act of entering a country by force |
| launch | send into the air by force |
| receive | get |
| spaceman | man who comes from another planet |
| station | place that sends out radio signals |
| stay tuned | stay on the same radio station |
| feeling a little bit numb | without much feeling in his mouth |
| in search of | looking for |
| galaxy | very large group of stars and planets |
| drift off | slowly go |
| noticed | knew for the first time |
| assembling | putting together gathering |
| remote places | places that were hard to get to |
| navigation | ways of finding directions |
