根据句意，用括号中所给词的适当形式填空。
Don’t give up ________________(study)English well. It’s very important for us.
To ________________(us)surprise, he has made much great progress.
Can you make a ___________________(decide)about it?
Nobody likes to be friends with anyone who is __________________(honest).
The old man is ＿＿＿＿＿(know),he almost(几乎)knows everything.