化学 高校生 3年以上前

for their only company ってどういうことですか？ あと、下線部（3）の訳を教えていただきたいのですが

Many working mothers have had to give up their jobs The (2) - they cannot secure places for their children at such facilities. problem has become severe, and even students who are fortunate enough to receive admission to an after-school club benefit for only a limited time. Many others stay home alone, often (3)with a TV or 15 computer for their only company. nim at the problem and is trying to

化学 高校生 7年弱前

How?

15 1 @)ww Of the following have the same electron arrangement?. 外 36C 40. 3 40Ca+ 人Cl 37CI 19AT 38K+ 20Ca 交*, 3 an 38r oy 幸CL ,拉CT and 39ca ony 恋, 94r and 38KY ony 至CT 9Ar and 43K- only 38caT,提Ar and 33K-ony 41Kー K