A Christmas tree is ______ sign that can only be understood as far as ______ certain cultural understanding is concerned.
.______ I’m well again, I can go on with my work.
.The reason for his success is ______ he worked very hard.
.Can you tell me ______the railway station?
.______surprised me most was______ they had finished the work so quickly.
.The foreign guests, ____ were government officials, were warmly welcomed at the airport.