English Senior High over 7 yearsago

なぜ⓷が答えなのか教えて下さい。お願いします。

the tools ( ) he built hiS own house 283 These arで @that ③with which ④mwiththat HU ⑦ which

English Senior High about 8 yearsago

答えは③なんですが、どうしてwithがいるのかわかりません

English Senior High over 9 yearsago

They are cold and need something to keep warm and make tools with. これ、どういう意味なのでしょうか？ (文末に"with"がきているのが意味わかりません😭)