1. The children have been indoors all day. Let them play _____ (在户外) for a while. 2. If you want to speak good English, a large _____ (词汇量) is needed. 3. He had lost his _____ (身份) card and was being questioned by the police. 4. Do you have any trouble with _____ (拼写). 5. He speaks with a strong southern _____ (口音). 6. I _____ (辨认出) her voice the moment she started speaking on the phone. 7. Because of the disease Professor Hawking lost his _____ (能力) of speech and had to communicate with other scientists through his computer. 8. A _____ (手提箱) is enough to take your clothes with you on holiday. 9. He sent a _____ (系列) of stamps as my birthday gift. 10. There was a time when people were _____ (要求) to stay indoors because of SARS.