It was during the Ming Dynasty ________ the Great Wall was repaired and extended to take on the appearance it has today.
| A．when | B．which |
| C．what | D．that |
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 |
Liping has never gone to Japan, but he speaks Japanese____ he were Japanese.
| A．even if | B．as though | C．even so | D．as long as |