He fell asleep immediately last night; he must ________ (be) very tired.
have been
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Herefusedtotelluswhetherhe________(undertake)thejob.
Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
Iwonderifhecouldgetit________(do)beforetomorrow.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
Ipreferthisdiagram________thatone.
