Language is a linguistic system and a means for doing things.

(单选题)David forgot to ______ his book with him when he came here. (单选题)After a short ______, someone suddenly made a loud noise. (单选题)The apples on my desk are bigger than ______ on my brother’s (单选题)We haven’t decided ______ we will take a trip to the beach t (单选题)Snow ______ on the roads, so it is dangerous to drive. (单选题)______ useful water is! We must save it. (单选题)Troy chose to leave his unhappy memories ______ and move on (单选题)25.（ ） (单选题)24.（ ） (单选题)23.（ ）