根据句意，用所给动词的适当形式填空。
1.Millie ___________(prefer) calligraphy(书法) to dance in the past.
2.If you ________ (be not ) careful, you may make the same mistake next time.
3. He makes over 50 sounds from water by (control) the speed of water flow.
4.Daniel has spent as much time as he could _________(improve) his English.
5.Anne and her family ____________(force) to move to another country because Nazis wanted to kill Jews..
1. preferred,2. aren’t, 3.controlling ,4. improving,5. were forced