1. First as a PC and then as a laptop, I __________(use) in offices and homes since the 1970s. 2. Over time my memory __________(develop) so much that, like an elephant, I never forget anything I __________(told). 3. Since the 1970s many new applications __________(find) for me. 4. I have also _______(put) into robots and used to make mobile phones as well as help with medical operations. 5. I ________________(put) into space rockets and sent to explore the Moon and Mars.

课文内容复习：用动词正确形式填空．

have been used

has developed

have been told

have been found

been put

have even been put