________ is a very clever scientist who can’t walk or even speak, but he regards his many physical problems as unimportant.
The doctor asked her__________ more fruit.
Thank you very much for __________ us so well.
Tom and Mary _______ to China last month.
--- What’s the use of this kind of fuel(燃料) ? --- It can make the train __________ fast.
---Help yourself to some chicken , Jim . ---__________________