—I hear Jane has gone to the Holy Island for her holiday.—Oh, how nice! Do you know when she  ____ ?

Scientists still wonder whether cloning will help or harm us and where it ____ us.

New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.

My last job lacked variety; I __________ the same things all the time.

—Have you worked here since you graduated?—No, I ________ at a factory in Beijing for six years.