It has been five years ____ I came to thisschool.

I’d like to invite you to my birthday party this evening.—Thanks, but ____ I’ll have time I’m not sure at the moment.

” ” is used to tell us that we should learn something step by step.

The woman hurt in ________car crash is still under ______ treatment in hospital.

At our factory there are a few machines similar to______ described in this magazine.