1 . Oil prices have         their highest level for almost ten years

A．impacted

B．benefited

C．crowded

D．approached

2 . My most ______ moment was trying to introduce a woman whose name I couldn’t remember.

A．embarrassed

B．embarrassing

C．convenient

D．beneficial

3 . We should try to keep the ________(平衡) of nature to protect the earth.

4 . She realised that one of the greatest ________（好处; 益处）of the Internet was its ability to remove the distance that usually exists between people. （根据汉语提示单词拼写）