His grandfather ________ for seven years.

ly somehospitals in China have adopted ______ they call a robot-doctor, ______ will beused to operate on patients with more accuracy

Simon made a big bamboo box ________ the little sick bird till it could fly.[ ]

________ you have to do the job, you should try your best to do it well even though it may be very difficult for you

What are you doing this afternoon—My computer is broken. I have to have it repaired this afternoon.