We live day by day, but in the great things, the time of days and weeks __________ so small that a day is unimportant.
Not until they left school how much their teachers loved them and helped them.
This new kind of chemicals will help keep the air, soil and water________ from pollution.
---I have cleaned the room three times a day. Look, It is a mess again. ---! Wait until the children go to bed.
Not for a moment ______ sightseeing while in Europe.
He ______be lazy, but he can work hard when he feels like it.