根据汉语提示，用单词的正确形式填空，每空一词。

（1）Have scientists discovered any life out there in ________（太空）yet?

（2）Judy suddenly ________（意识到）that all her friends were helping her, and she was moved.

（3）Diana isn’t sure ________（是否）Betty will come or not.

（4）My sister Tina often ________（收集）litter with some volunteers in the park.

（5）Don’t be ________（害羞的）when you speak English in public.

（6）Boys and girls, you’d better take off your ________（夹克）. It’s hot on the train.

（7）Adam has just ______（拒绝）to play football with them because he’s busy with his final exam.

（8）It’s important for everyone to keep ________（镇静的）when the earthquake happens.

（9）December is the ________（第十二）month of a year.

（10）The green leaves start to turn gold, then brown in ________（秋天）.