My math teacher often goes to school _____. [ ]

I will call you as soon as I ______ to Japan.

I called you at half past nine this morning, but there was no answer.——Oh, sorry. I _____ with my cousin in the supermarket.

It was nothing but 10 years of hard work that _______his success in business.

Einstein, the famous scientist, was born _____ March, 1897. [ ]