useful idea?还是 a useful idea?哈哈哈

useful idea?还是 a useful idea?哈哈哈 an useful animal?还是a useful animal? useful前是加a还是an an ufesul还是a useful Use your head and you'll get a idea 改错 an useful book还是a usefull book? useful one前用an还是a useful前面用an还是a?为什么? 选all the time 还是 from time to time?It's a really useful dictionary.I use it __.It is always in my pocket what a good idea还是what good idea 是an good idea还是a good idea? 是an good idea 还是 a good idea ,为什么 ______warm idea suddenly came to me that i might use the pocket money to buy a gift for my mom.用A 还是The a useful Arguing with such a stubborn person is ____ .A of great B of no use C useful D no use 是an useful book还是a useful book 加a 或者an 主要看什么 Don't throw away the____books.They may be useful one day.A.using B.used C.use D.to use They find it __ to learn English.A、use B、uses C、using D、useful