A. 根据语境及首字母填写单词。
1. It is very w today. Let's fly a kite in the park.
2. The sky is c. I think it will rain soon.
3. It's d in the evening. We can see many stars in the sky.
4. The weather is d in winter in the north of China. It doesn't rain much.
5. My mother asks me to s at home because it's cold outside.

1. windy 2. cloudy 3. dark 4. dry 5. stay

1. 由后半句“让我们去公园放风筝”的语境，放风筝需要有风，结合首字母w，此处填形容词windy，意为“多风的”。
2. 由后半句“我认为很快就要下雨”的语境，即将下雨时天空是多云的，结合首字母c，此处填形容词cloudy，意为“多云的”。
3. 由后半句“我们能在天空看见很多星星”的语境，夜晚的天空是黑暗的，结合首字母d，此处填形容词dark，意为“黑暗的”。
4. 由后半句“不怎么下雨”的语境，中国北方冬季天气少雨很干燥，结合首字母d，此处填形容词dry，意为“干燥的”。
5. 由后半句“外面很冷”的语境，妈妈让我待在家里，stay at home是固定短语“待在家里”，搭配ask sb to do sth结构，此处填动词原形stay。

B. 辨析用法,填序号。
(1)be going to用法:①提前做好的计划;②有明显迹象的天气变化。
1. I am going to visit my grandma this Sunday.
2. Look! Black clouds are in the sky. It is going to rain.
3. We are going to play football after school.
(2)will的用法:①天气预报的单纯预测;②临时的决定/提议。
1. The weather report says it will be hot tomorrow.
2. It's late. I will to go home at once.

(1) 1. ① 2. ② 3. ①
(2) 1. ① 2. ②

我们结合题目给出的固定用法规则逐一判断：
1. 针对be going to的用法辨析：
第1句“I am going to visit my grandma this Sunday.”含义是我计划这周日去看望奶奶，属于提前做好的安排，对应用法①。
第2句通过天上的乌云这个明显迹象预判即将下雨，属于有明显迹象的天气变化，对应用法②。
第3句“We are going to play football after school.”含义是我们计划放学后去踢足球，属于提前做好的计划，对应用法①。
2. 针对will的用法辨析：
第1句内容是天气预报对明天天气的预测，属于天气预报的单纯预测，对应用法①。
第2句是发现时间很晚之后临时做出的立刻回家的决定，属于临时的决定，对应用法②。

【Language Focus】
词汇与语法
阅读短文,完成下列任务。
A Happy Weekend with Good Weather
It's Friday evening. Tom and his family 1. (plan) their weekend carefully. Tom 2. (visit) his uncle in the countryside this Saturday. Yesterday he called his uncle to make the plan.
The weather report says it will be 3. (sun) on Saturday morning. But in the afternoon, black clouds will come. It 4. (rain) lightly, so Tom's family are going to take umbrellas. On Sunday, it won't be rainy. It will be 5. (wind) but warm. Tom and his cousin are going to play football in the park. They are sure they will have a great time!
任务一:请在横线处写出所给词的适当形式。
任务二:根据短文信息,用 be going to 或 will 加所给词的适当形式填空。
1. Tom (visit) his uncle because he made the plan yesterday.
2. The weather report says it (not rain) on Sunday.
3. Tom's family (take) umbrellas because it will rain in the afternoon.
4. It (be) windy but warm on Sunday.

任务一：1. are planning 2. will visit / is going to visit 3. sunny 4. will rain / is going to rain 5. windy
任务二：1. is going to visit 2. won't rain / will not rain 3. are going to take 4. will be

任务一解析
1. 句首点明时间是周五晚上，描述此刻正在进行的动作用现在进行时，主语Tom and his family是复数，be动词用are，plan的现在分词为planning，因此填are planning。
2. 时间状语this Saturday表示将来的时间，描述已经安排好的未来动作，用一般将来时，因此填will visit / is going to visit。
3. 空格前是be动词，此处需要填入形容词作表语，名词sun对应的形容词形式是sunny，意为晴朗的。
4. 描述未来会发生的天气变化，用一般将来时，因此填will rain / is going to rain。
5. 空格前是be动词，此处需要填入形容词作表语，名词wind对应的形容词形式是windy，意为多风的。
任务二解析
题目要求用be going to或will结构填空：
1. 拜访叔叔是提前制定好的计划，主语Tom是第三人称单数，符合be going to表示预先计划的用法，因此填is going to visit。
2. 天气预报描述周日的天气否定情况，用will的否定结构，因此填won't rain / will not rain。
3. 带伞是提前做好的安排，主语Tom's family是复数，因此填are going to take。
4. 描述周日的未来天气状态，用will加be动词原形，因此填will be。