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.