15. She was lifting handfuls of fine sand and letting it pour __________ her fingers.
— How long is it ______ you picked up your badminton training?— It was not until my finance became better in last December ______ I started the training.
The young teacher found it hard to _____ his explanation in class to most of the class.
—Tom, your lazy bone! You left the dishes unwashed again!—_______? Mom isn’t at home and she can’t hear you.
The driver was at _____ loss when ______ word came that he was forbidden to drive for speeding.
One of the most important things in education is to let students ____ positive emotions and experience in the process of their learning.