You will not succeed ______ you work harder.
| A．if | B．when | C．unless | D．because. |
John, work hard ________ you will make much progress.
| A．or | B．nor | C．but | D．and |
Could you please get me some ________? I’m hungry.
| A．apple | B．water | C．bread | D．egg |
Please send ________ best wishes to Mary.
| A．I | B．me | C．my | D．mine |
I go to school ________ bus every morning.
| A．in | B．on | C．at | D．by |
Look! There is ________ cat in the tree.
| A．a | B．an | C．the | D．/ |