21. The speaker paused, expecting a/an _______ but getting only a nod.
A. reaction B. response
C. award D. reward
【解析】选B。考查名词辨析。句意为: 演讲者停了一下，盼望得到回答，但只得到了点头。response回答，答复。reaction反应；award奖，奖赏；reward报酬。
22. Do come back home early tomorrow _______ we’ll toast to Father’s birthday with a glass of wine together.
A. otherwise B. then
C. and D. or
【解析】选C。考查连词。句意为：明天一定早点回家，我们将一起为父亲的生日干杯。句子结构为“祈使句+and+陈述句”。
