It is widely reported in the western media that thedrug ______ is now becoming a leading cause of teenager crimes.

Lucy, when will you plant trees, this Saturday or Sunday— time is OK. You decide.

Do you know how I can ____ him—On his mobile phone

If we are not _______ the progress we have made, we will have greater success.

______ where to have a picnic for several days，the big family finally made a decision.