根据下面句子的意思及所给汉语提示，写出空缺处单词或短语的正确形式。

1. Yesterday the heavy rain ______________ (阻止) us from going out for a picnic.

2. I went to the hospital last weekend to look after some ______________ (病人).

3. I'm very ________________ (有帮助的) to my parents.

4. Dalian _______________ (位于) the northeast of China.

5. She is _______________ (简单地、简朴地) dressed.