Could I use your phone —Yes, of course you ____ .

Where did you find our chemistry teacher? —It was in the lab ______ he was doing his experiment.

The companies are working together to create ________ they hope will be the best means of transport in the 21st century.

The company had about 30 computers but only one-third used regularly.Now we have 60 working all day long.

I didn’t expect that so many people ___ to join in the work.