5.4 从刚才背过的单词中选出最适当的填入空格内.(注意时态哟)

1. Man's landing on the moon is the most ( ) event in all human history.

2. The champion has ( ) his championship title longer than anyone else.

3. Plans for selling the new products are now in ( ).

4. The ( ) on your hand will soon be well.

5. Please rub the ( ) off the old helmet.

答案:
remarkable;

retained;

preparation;

scratch;

rust;