小题1:Only then did he decide to give up his plan.
小题2:The cyclists who were trapped in the mountain were rescued finally.
小题3:He is so stubborn that nobody can persuade him to change his mind.
小题4:Although he was buried in his work, his boss thought little of him.
小题5:I often have one student make a speech in English to get them interested in English.

小题1:Only的倒装需要满足两个条件，only放在句首，且强调状语，本题only放在句首，强调的是时间状语then.
小题2:固定词组be trapped in…被围困在…中
小题3:固定句型：so…that…如此…以至于…
小题4:固定词组埋头于…be buried in…;对…评价很低think little of…
小题5:动词短语：让某人做某事have sb do sth.
点评：本题型考查学生的语法掌握情况和在上下文语境中恰当运用语法的能力。