heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Thosewho’dliketovisittheexhibition________(sign)yournameshere.
Hotmetal________asitgrowscooler.
Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
