The bus ____ at six, but it arrived an hour later.
| A．should arrive | B．had arrived | C．should have arrived | D．must arrive |
Cathy is taking notes of the grammatical rules in class at Sunshine School, where she __________ English for a year.
| A．studies | B．studied |
| C．is studying | D．has been studying |
We live day by day, but in the great things, the time of days and weeks __________ so small that a day is unimportant.
| A．is | B．are |
| C．has been | D．have been |
As the years passed, many occasions—birthdays, awards, graduations — __________ with Dad’s flowers.
| A．are marked | B．were marked |
| C．have marked | D．had marked |
Danny __________ hard for long to realize his dream and now he is popular.
| A．works | B．is working |
| C．has worked | D．worked |
—I saw Jane and her boyfriend in the park at eight yesterday evening.
—Impossible. She __________ TV with me in my home then.
| A．watched | B．had watched |
| C．would watch | D．was watching |