29. When it rains, you cannot help but _______ your shoes wet.
---Must I clean the window now? ---No, you ______.
In order to attract more customers, many supermarkets usually sell their goods at a good ______ at weekends.
---When can I come for the English books? I need them tomorrow afternoon. ---They ______ be ready by half past eleven.
The young man is a person of great perseverance(毅力), from which he ______ a lot.
---What will you do next Sunday? ---Maybe do some shopping, for I ______ go to school on Sunday.