ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.
A、mustn’tNight________(fall),wehurriedhome.
Iwonderifhecouldgetit________(do)beforetomorrow.
Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Ipreferthisdiagram________thatone.