根据括号中所给的汉语写出单词。 ⑴Those boys like playing hide-and-seek and often hide (在…之中) the trees. ⑵How beautiful she is and her skin is as (光滑的)as silk. ⑶She is looking forward to (收到) letters from her friends. ⑷The heavy smog makes it more difficult for us to see traffic signs (清楚地). ⑸After several (星期) study, we will have our senior high school entrance exam. B)根据句子意思,用括号中所给单词的正确形式填空。 ⑹In the morning, taking a walk and (breathe) some fresh air are good for your health. ⑺He was (terrible) hurt and had to stay in hospital for a long time. ⑻Many (wood) houses have been built for the tourists in this area recently. ⑼Mr. Brown (prefer) hiking to running when he was in his twenties. ⑽Tian' anmen Square is always filled with (visit) on National Day.