用所给动词的适当形式填空，完成短文。

Dear Mum,

　　I had a school trip last May Day. We   1    (spend) the first four days in

Paris. We    2    (have) a sightseeing of the city and we also    3   (visit)  some

of the famous places such as the Eiffel Tower and the Louver. From Paris we

traveled down to the south of France near Marseilles by boat. We spent five days

there.

　　There we     4   (have) a lot of fun. We   5   (swim)  in the sea   6   (take) a

lot  of pictures. We also   7    (do) lots of sports on the beach. We   8    (go)

back a week later by train. I think the trip   9   (be)interesting. I liked the food

best. It  10   (be) delicious.

                                                                         Love,

                                                                         Betty

假设开发法最基本的公式为：待开发房地产价值=开发完成后的价值+后续必要支出及应得利润。（）