—Is the experiment easy? — ________ . I’ll just do my bit.
. — Do you know why the teacher asks for me? — He wants you to _________ your absence(缺席) last night.
. Sometimes she’d ask the driver to stop in front of a particular building and would sit _________ into the darkness, saying nothing.
. — His mother was ill and he had to look after her in hospital. — That’s _________ he was absent from the meeting.
. . The naughty boy _________ to me that the hen _________there just now had _________ two eggs the day before.
. . After going into the concert hall, the mother _________ a friend and went over to greet him.