21、《保卫延安》的作者是( )。

162、We were comforted by his promise ( ) he will make us a prompt reply as soon as he reaches there.

161、I can hear birds singing, but there are no birds ( sight.

160、That story reminds me ( an experience I had long ago.

159、The Brownings have not ( ) yet and I doubt whether they will come.

158、But the Swiss discovered long years ago that constant warfare brought them ( ) suffering and poverty.

157、Just as the soil is a part of the earth, ( ) the atmosphere.

156、It is only when you nearly lose someone ( ) fully conscious of how much you value him.

155、My pain ( ) apparent the moment I walked into the room, for the first man I met asked sympathetically: “Are you feeling all right?”

154、The fear was ( ) and soon everybody was trying to escape.

153、The police have had to drop charge against him because they couldn’t find any ( ).