Misunderstandings ________ from lack of social communication, unless ________ properly, may lead to serious problems.
. With age, the mineral content of human bones decreases, ________ them more fragile.
. Let's go a little faster, ______________ we'll never get there on time.
. —How long have you been here? —Only about five minutes. Henry and Simon _____________ here with me.
. —Was _________________ problem solved? —We were trying to think of _________________ way out, but it was difficult to find one.
. Take the spare batteries with you _________________ you need them.