_____ is no doubt _____ John’s knowledge of first aid saved Ms Slade’s life.

Though it’s not the 1st time that I ________ Beijing, I still can’t adjust myself to the weather. 

He kept smiling secretly and we were all wondering      that made him so happy.

The shop manager always says to his assistants, "We can never be ____customers.

Jane failed to gain a well-paid job due to her poor education, even though she is______ to get one to save money for further education.