Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
Howlong________they________(dig)theditch?
Iwonderifhecouldgetit________(do)beforetomorrow.
Night________(fall),wehurriedhome.
Night ________ (fall), we hurried home.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.