用括号中所给单词的适当形式填空 。 小题1:On his ______(twenty) birthday, his father gave him a new bike. 小题2:Their teachers are so friendly to students as _______(we). 小题3:The more we help others, the ________(happy) we feel. 小题4:The police caught two _______(thief) last night. 小题5:There are some __________(different) between the twins. |