The scientists put all their hearts into________(medicine)research.
为了获得好成绩他们应当把时间花在学业上.
They should time on schoolwork get good grades.
今天早上六点钟妈妈像往常一样把我叫醒.
My mother me up at six this morning .
Jenny在她十八岁时上了大学.
Jenny went to college 18.
The joke made him (laugh) again and again.
We already (clean) the room.