21. be covered with 被……所覆盖……
22. be in (great) need of (很)需要
23. be in trouble 处于困境中
24. be glad to do sth 很高兴做某事
25. be late for…… 迟到
26. be made of (from) 由……制成
27. be satisfied with 对……感到满意
28. be free 空闲的
29. be (ill) in bed 卧病在床
30. be busy doing (with) 忙于做某事