He_____hamburgers
Thechildrenhavesomeapples.(改为单数句子)
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Icansee______inLucy'sroom.
Ithinkthe______(four)lessonisthemostdifficultinthisbook.
Look，mygrandmotheris_____mygrandfather
Ihaveapenfriend，andwealwayssende_____toeachotherbycomputer
