Smile is recognized as a/an _________ language, which can be understood by people all over the world.
At the railway station, the mother waved goodbye to her daughter until the train was _______.
We have no idea at all __________.
_______is certain ______ the Normans conquered England in 1066 and then English changed.
Many years of hard work_______ his great success in the development of this new type of material.
Danby left word _______he would call again in the afternoon .