Who the company, Mr. Wang or Mr. Li?
Some students have trouble _______grammar while others have difficulty—___ new words.
We were going out for a walk ________ it began to rain.
— What did Tina say just now? — She asked ____ this summer holiday.
Bill’s fully ____ from his heart disease. He is very happy.
While____the dog,you should take care not to____.Otherwise,it may be dangerous to strangers.