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根據下面短文，用括號內所繪動詞的適當形式填空。

My aunt is an engineer in America．She __1__（work）in the Company of Microsoft since 1986．Last month she __2__（come）back to China．We were very happy to see her on May Day．After we finished lunch，we showed her around our hometown．

“This hotel __3__（build）last year．Look，the workers __4__（put）up another one over there．”

“What a great change!” aunt said．

“We __5__（plant）more trees and flowers in the town soon．And we'll do something to stop the factories from __6__（pour）the waste into the river．” I told her．

Aunt was very pleased with what she saw．When we asked her __7__（stay）longer，she answered，“No，I can't．I must __8__（fly）to Beijing tomorrow．I have an important lecture to give．If I __9__（have）time，I'll certainly come back again．Though I live in America，I'll always be Chinese．I should do something for our hometown．Let's __10__（make）contribution to it together．