There are a multitude of things I have to do every day.

multitude of cares
《a ～》数多い苦労

multitude of experience
《a ～》豊富な経験

multitude of national and international space research experiments
《a ～》数多くの国内外の宇宙研究実験

multitude of people
《a ～》多数［大勢］の人

multitude of problems
《a ～》幾多の問題

multitude of readers
《a ～》多数の読者

multitude of separate objects
《a ～》多数の独立した物体

multitude of services
《a ～》数多くのサービス

multitude of someone's writings
《a ～》（人）の著作のおびただしさ

multitude of sources of energy
《a ～》多くのエネルギー源

A multitude of options went through his mind before he made his decision.
決定を下す前に、多数の選択肢が彼の頭に浮かんだ。

There are a multitude of things I have to do every day.
毎日、やるべきことは山のようにある。