下列各组句子中加横线的字意思相同的一组是（ ）

Too much pressure from study leads to sleeplessness, which _______ increases the risk of forgetfulness.

When Xie Lei made progress in her study abroad, her parents encouraged her to ____.

1You can walkthe bridge the river.

Mum, I’m really ________ about the result of theexam.—Cheer up. I believe you can be successful.