The correct answer choice for the sentence given is; Choice A; hadn't gone / were.
<h3>What is the best way to complete the sentence?</h3>
According to the task content, it follows that the subject of the sentence is plural.
Additionally, the sentence tense is past and on this note, the correct answer choice is Choice A.
Read more on tenses;
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Answer: The uses are as follows :D
1. Lithium: heat resistive ceramics, aircraft building, tritium production
2. sodium: coolant in nuclear reactors, soap making, street light manufacture (e.g. sodium vapor lamps)
3. Potassium: tanning of leather, manufacture of inks, making gunpowder
4. Rubidium: thermoelectric generator, making atomic clocks, working fluid in vapor turbines
5. Cesium: catalyst for hydrogenation of some organic compounds, vacuum tubes, photovoltaic cells
6. Francium: extremely radioactive and extremely rare so not used often
Answer:
caca popo caca popo caca popo caca popo caca popo caca popo caca popo caca popo caca popo caca popo caca popo caca popo caca popo