raise|raised|raising

他们确实提高了学校的标准。

They've certainly ___raised standards at the school.

许多学生举起了手。

Many students ___raised their hands.

他们正在为慈善事业筹款。

They were ___raising money for charity.

每周一我们在学校升旗。

Every Monday we ___raise the flag at school.