1、My grangma _died____(die) when I was_____ (be) only three years old.
2、Ben _made____ (make) a model plane just now.
3、Ben _hasn't made____ (not make) a model plane yet.
9、She _has studied____ (study) in Shanghai for three three years.
10、He _wrote____ (write) a letter to me last night.
11、My teacher isn't in Shanghai.She has gone_____ (go) to Thailand.
12、The train ___left__ (leave) the station fifteen minutes ago.
13、Kitty __has___ already _bought____ (buy) a new pair of trousers.
14、___Have__ you ever _been____ (be) to Shanghai Zoo?
15、It __has been___ (be) almost ten years since I last ___saw__ (see) your daughter.