— Would you like to join us in a field trip this weekend? — I’d like to. But I can’t ______ the time because I have an important exam to take on Monday.
There are many talented actors out there just waiting _______.
---- Does your brother study in Beijing University? ---- No, not now. But he ________ there for 7 years.
---- Oh, it’s raining hard outside. Do you think the milkman will arrive? ---- Of course. He will come on time ________ it rains.
To keep healthy, most retired old people____ jogging as a regular form of exercise.
John, may I use your computer now? Sorry, it is not ____at the moment. It is being repaired.