根据中文提示，用词组的适当形式填空。 1. Children often have ________ ________ (许多)fun in the school sports meet. 2. The teacher said “You can ________ ________(上交) your homework tomorrow. 3. The bridge is ________ ________ of(由……组成) the stones. 4. ________ ________ (最后), we hold a party to celebrate New Year! 5. There are many kinds of animals ________ ________ (处于危险中). 6. Yesterday my teacher ________ me ________(把……错当成) my twin brother. 7. The doctor always ________ ________（检查）his patients carefully.