用所给单词的适当形式填空。

1. My life has         (change)a lot in the past few years.

2. My    (big) problem is that I can't speak English.

3. She couldn't find her son9 so she was very       (worry).

4.I used to        (get) up late.

5. If it       (not rain) tomorrow, we'11 go on a picnic.

根据ERG里论，下列说法正确的是( )。

A．该理论提出三种核心需要：生存需要、安全需要、成长需要
B．各种需要可以同时具有激励作用
C．如果高层次的需要得不到满足，对低层次需要的欲望也会降低
D．该理论的独特之处在于认为低层次需要的满足是高层次需要的先决条件