—Why didn’t you answer the phone when I called you last night?
—Sorry, I __________ a bath upstairs.
| A．am having | B．have | C．was having | D．had |
____ printed, this science fiction will be popular among the students.
| A．Before | B．Unless | C．When | D．Once |
The manager commanded that the work ____ finished by the end of this month.
| A．should be | B．will be | C．must be | D．ought to be |
Selecting a mobile phone for personal use is no easy task because technology ____ so rapidly.
| A．will change | B．has changed |
| C．will have changed | D．is changing |
The leader of the factory told us that very little ___was made of the waste material in the past.
| A．cost | B．value | C．use | D．matter |
Please tell me the way you thought of _______ to stop smoking.
| A．make up your mind | B．to make up your mind |
| C．making up your mind | D．to making up your mind |