This is a cheap and simple process(过程), ____ ,there are dangers.

_____ will people have robots in their houses In about 100 years.

ked me _______ I had returned the books to the library, and I admitted that I hadn’t.

Our school is so famous that ___ people come and visit it every term.

In fact, more and more people ____ to live a greener, healthier and more environmentally “green life”