is known to all that Taiwan is part of China and it shall not be separated from the mainland.
It never occurred to humans until the mid-1990s ______ some animals can be cloned.
---You look unhappy. Did you fail the tests? --- I ______ the written papers but didn’t pass the oral examination.
I’ll prepare more dishes_________ your guests decide to stay for dinner.
Large quantities of information, as well as some timely help _____ since the organization was built .
---Mary’s score on the test is the highest in her class. ---Really? She ______ have studied very hard.