—When shall we go for an outing? —It's up to you. Make it time you like.
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.