用正确的时态填空.急
My watch doesn't work.I have to have it ______ (修理).
If a problem _____ (使...担忧) you , go and talk to your teacher.
To develop the ______ (有实践经验的) skills of using English is very important for the English teachers.
Tiger watch plays an important role in ______ (教育) the public about these animals.