老师好！
1.She appeared on the cover of the magazine _______ his bravery and hard work during the outbreak.
2.She is looking for safe ways to get outside and exercise _______(由于) the Covid-19 crisis.
可以填什么呢？
for,since,as后面除了加句子，还可以加短语吗?
不可以。这几个表示原因的时都是连词。
