Поставьте
глаголы, данные в скобках,  в Past Indefinite Tense (прошедшее неопределенное время):

1. They
(to study) many subjects last year.

2.    
He (to enter) the university in 1998.

I (to
go) to the university by bus

1. They studied many subjects last year.2. He  entered the university in 1998.3. I went to the university by bus