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根據(jù)括號內(nèi)的漢語提示，用句末括號內(nèi)的英語單詞完成句子。

1．It was in 1976 ________(我們才開始引進(jìn))this new technique．(bring)

2．________(他一定受益了)a lot from the experience of studying abroad, because his oral English has been improved greatly．(benefit)

3．________(沒必要擔(dān)心)even if you have never skied before．(need)

4．China has been ________(扮演著重要的角色)in maintaining international peace and security．(role)

5．Having lived in the mountain village for several month, he finally ________(習(xí)慣了早起)in the morning and sleeping early in the evening．(used)