David couldn't tell __________ from far away whether the green traffic light meant going straight or turning left.
______ might be expected,the answer to the question was very mixed.
As a matter of fact,his remarks left me ______ about his real purpose.
_______ difficulties we may com across, we'll help one another to overcome them.
So little known _____ that soldiers had to ask for a guide.
This monument was built in honor of the scientist who was believed ______ the first telephone.