【小题1】A person who_________________(遵守诺言) is always welcome in the group.
【小题2】When seeing the frightening bear, the little boy____________________.(屏住呼吸）
【小题3】Who is   _________________ (因……受责备）starting the fire?
【小题4】__________________(暴露在）nuclear radiation, even for a short time, may producevariants(变异体）of genes in human bodies.
【小题5】I think teachers need to_________________students.(对…严格）