A．changeB．observeC．improveD．meet

A．speakB．observeC．sayD．remark

【C4】A．changeB．alterC．varyD．differ

【C6】A．changeB．mistakeC．differenceD．mark

【C2】A．changeB．decisionC．reductionD．relation

【C6】A．changeB．notesC．checksD．bills

The engineer put forward a （suggest) ______ at the meeting to improve the public traffic s