根据句意和单词的首字母提示写单词。 1. This question is d_________. I can't answer it. 2. I have no brother or sister, b_________ I have many friends. 3. I like playing computer games.It's very i_________. 4. He has o_________ one pencil in his pencil case. 5. —Let's play soccer.—That sounds f_________.