根据句子意思，用括号中所给单词的适当形式填空，并将答案填写在答题卡标号为51-56的相应位置上。

小题1:My daughter is old enough to look after         (she). She can stay at home alone.

小题2:We need to realize the         (important) of making full use of our time.

小题3:It’s so         (fair)! Mary has got more money for less work!

小题4:The students are looking forward to         (have) a holiday. They are just too busy these days.

小题5:— Jimmy will hold a party for his         (twelve) birthday. Let’s buy a present for him.

— OK. Let’s go.

小题6:It rained so         (heavy) last night that many streets were in water.