—Was it 11 o’clock you begin doing your homework last night?—Yes, things are always eating up my precious time.
If you are not familiar ____ the topic, you may write something that is familiar ____ you.
According to your father’s will, you have to ____ a record of every penny you spend, including bus fares.
We would rather die than ______ difficulty.
Is it true that light travels in a straight line and never ______ it hits something that reflects it.
You have to keep on learning if you want to keep ______ with the development of modern science and technology.