—Did Jack come back early last night?
—Yes, It was not yet eight o'clock _____ he arrived home．
| A．when | B．that | C．before | D．until |
I looked for my pen for a long time last night，but it ______ in my pocket this morning. How strange!
| A．turned out | B．turned on | C．turned up | D．turned down |
Life is___,but there is no limit_____.
| A．limited，to learn | B．limit，to learn |
| C．limited, to learning | D．limited，of learning |
They stopped fighting but stood there, ____each other without saying anything.
| A．glaring_at | B．staring_at | C．glancing at | D．glared at |
The boy fell asleep where he ______,without undressing.
| A．was laying | B．was lying | C．had laid | D．had lied |
Some countries are increasing their use of natural gas, and other forms of ______.
| A．source | B．energy | C．power | D．strength |