—How much is _______ for a schoolbag?—Experts say students should carry_______ more than 10 or 15 percent of their body weight.
The governments are very cautious about setting a new policy and make no decision _____ they are quite sure it is the right one.
Instead of winning ___ gold medal as had been expected, this world record holder only came ____ fifth in the game.
— Pity you missed the lecture on nuclear pollution. — I ______ it, but I was busy preparing for a job interview.
. His stepmother is kind to him, ______ whom she has a deep love.
The naughty boy was muddy because he _______ soccer in the rain all afternoon.