She often sleeps during the day time, because her work is on night _____.A.turnB.shi

Food was ________ during the famine. It was often seen that people sold their childre

She said her family （)themselves（) the army during the war.A、has hidden, fromB、had hidde

What is the situation of your brain during the sleep before an exam？A．It is deeply relaxed

During the summer vacation, kids are often seen hanging______in the streets.（2010-67)A．abo

During the winter sleep, black bears always______.A．sleep like other woodland animalsB．kee

Why do people sometimes have trouble sleeping？A．Because they fail to rest during the day.B