If ______ in wet sand, the vegetables can ______ fresh for a long time.
If law and order ______, neither the citizen nor his family is safe
At the bus stop ______ a soldier and two young people on their way to the village. 【选项】
Nothing but several glasses ________ bought by my father the day before yesterday.
The whole family _______ TV attentively.
What the children in the mountain village need ________ good books.