【B17】A．ordersB．messagesC．wordsD．letters

A． As a resultB． After allC． In other wordsD． Above all

【C16】A．sensesB．casesC．wordsD．means

【C6】A．excusesB．causesC．wordsD．reasons

【C13】A．excusesB．causesC．wordsD．masons

【C3】A．visitB．writingC．wordsD．signature

A．BufferB．Source-quench messagesC．windowD．WindowingE．Buffering