Our math teacher ________in our school for 20 years and he ________here when he was 23 years old.
Tom needs some help ________ his homework. Can you help ________?
--I'll go to Japan for a trip next month.—Great!________
John had a short walk after lunch, ________?
--Can I help you, boy?—Yes. There is ________ wrong with my bike.
________ food you've cooked!