You should try your best ____ your English.
| A．to improve | B．improving | C．improves | D．improve |
I’m afraid I gave you a lot of trouble ________ my stay here.
| A．in | B．for | C．during | D．on |
The singing group will have two performances ______ October.
| A．after | B．since | C．/ | D．for |
The supermarket is open ______ midnight.
| A．at | B．on | C．till | D．/ |
She didn’t go to work ______ that morning. She slept ______ noon.
| A．/…till | B．on…till | C．at…at | D．/…at |
He was ill _____ a week, and _______ the week he ate almost nothing .
| A．for/at | B．for/during | C．during/during | D．for/for |