题目内容：

汤姆邀请杰克下周六去他家，但杰克那天没空，因此不能赴约。假如你是杰克，根据提示写一封委婉拒绝汤姆邀请的信，说明你不能赴约的原因。70词左右。

提示：study for a test; have a piano lesson; go to the movies

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________