_______ weekdays we go to school _______ seven o’clock.
| A．In; at | B．At; at |
| C．On; at | D．Of; at |
Only after a year ______ to see the results of my work.
| A．I begin | B．I began |
| C．did I begin | D．began |
My family like to travel. Mother prefers to take a bus to travel, while father ______ to travel.
| A．stick to drive | B．sticks to driving |
| C．stick driving | D．sticks |
We'll never give up working on the experiment (实验), ______ difficult it is.
| A．no matter how | B．no matter how many |
| C．no matter what | D．no matter where |
After class, students ______ clean the chalk off the blackboard.
| A．was excepted to | B．are supposed to |
| C．are important to | D．was polite to |
The fish on the table ______. I want to eat it right now.
| A．smells good | B．smells bad |
| C．smells well | D．smells badly |