— Got your driving license?— No. I ________ too busy to have enough practice, so I didn’t take the driving test last week.[ ]

We are a little worried because we _____the ground as a leader in the field of IT with the others speeding updevelopment．

6. As there is less and less coal and oil, scientists are exploring new ways of making use ofenergy, such as sunlight, wind and water for power and fuel.

Lily doesn’t know what she and her friends can do to help the little boy that parents have left their hometown for making money.

____________ his returning, he will clean the room and wash clothes.