Do you have any difficulty ______ these flowers? I’d like to help you if you need.
I looked for my pen for a long time last night,but it ______ in my pocket this morning. How strange!
Life is___,but there is no limit_____.
They stopped fighting but stood there, ____each other without saying anything.
The boy fell asleep where he ______,without undressing.
Some countries are increasing their use of natural gas, and other forms of ______.