A chair made of steel is stronger, though costs much more, than _____ made of wood.
Obviously the measures taken by the local government have _____ the solution to drinking water problems in this region.
Could you drive me to the bookstore at noon if _____?
_____ I see the photo, I will always think of Mr. Li, who once was very strict with us.
I don't understand what the engineer means, but I’ve got ____ rough idea of ____ Project plan.
---Would you like to go out for a walk? ----.