1.I don't konw what-----(i,say)when I am in front of many people.

问题描述:

1.I don't konw what-----(i,say)when I am in front of many people.
2.I found it difficult ------(learn)English well.
3.There-------------(be)a music concert in the park next week end.

1) I should say
2) to learn
3) will be