heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
Tosucceedinascientificresearchproject________.
Thistest________anumberofmultiplechoicequestions.
Wooddoesnotconductelectricity;________.
