To my mind, the secret to happiness__________ your successful work and your contribution towards others’ happiness.
| A．results in | B．consists in | C．brings in | D．takes in |
We should do what we have to do ______ we can do what we want to do in the future.
| A．so that | B．in case | C．for fear that | D．now that |
Please don’t phone him between 1 and 3 p.m. tomorrow. He _____ a lecture then.
| A．has delivered | B．has been delivering | C．will be delivering | D．delivers |
If you are not satisfied with the price _______, we can still discuss it.
| A．being offered | B．to offer | C．offering | D．offered |
Drunk driving used to occur _______, but now it is under control.
| A．frequently | B．generally | C．practically | D．gradually |
Cooking calls for patience and time but it is enjoyable experience.
| A．a; the | B．不填; an | C．the; an | D．a; 不填 |