根据句意和汉语注释，写出单词的正确形式。

【1】I felt more relaxed as soon as I had made the_________（最后的）decision.

【2】I ________(取消)the trip to Beijing because of the heavy snow last year.

【3】The White House __________(或许、大概) won’t make the plan public until next month.

【4】Let us_______(假定) another star with conditions similar to those on the moon.