21.   Since then, observers attentively watched every step of this man and comment upon every slip.

22.   The embassy made no comment upon accepting the letter.

23.   The president made his comments upon departing for Dayton, Ohio, where peace talks are being held.

24.   Yoo made no statement or comment upon his arrival at Changi International Airport.

25.   He made no comment upon his arrival.

26.   Christopher made no comments upon arrival and headed directly to the presidential palace for his meeting with Mubarak, the sources said.

27.   The US officials made no comments upon arriving at Sarajevo airport.

28.   Primakov made no comment upon arrival in Brussels.