Going out for a trip with friends popular in the last few years.
| A．is | B．was | C．has been | D．had been |
The process of producing electricity may also give out CO2, ______ you heat your house with electricity instead of charcoal.
| A．as long as | B．as soon as | C．as if | D．even if |
---Why was the young lady taken away by the police?
---- She happened _______ something in the supermarket.
| A．to catch stealing | B．to catch to steal |
| C．to be caught stealing | D．to be caught to steal |
The project is based on an agreement, one of _____ purposes is to ensure that the project can be completed before the deadline.
| A．whose | B．which | C．its | D．what |
No decision _____ about any new operations until we have discussed all the details.
| A．is made | B．is being made | C．has been made | D．will be made |
— I am going to the dentist at 4 o'clock and it is 3：30 now.
— Well, if you ______ leave earlier today, please ask the director for permission.
| A．can | B．may | C．must | D．will |