Cullen, a Scottsh professor, 1 a small refrigeration machine in 1755, using a pump to 2 a partial vacuum over a ___3 of diethyl ether, 4 then boiled, absorbing heat from the surrounding air. At the time, it had no practical use and 5 never found a use for his invention. 1. designed , designs , was designing , have designed
2. creation , creating , create , creative
3. containing , container , containers , contained
4. whom , when , who , which
5. them , Cullen , cullen , him

GRAMMAR HELP ME PLEASE ,,,