About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.
The boy, as well as his friends, _______ watching TV last night.
______ is known to all, Taiwan is a part of China.
It was ______that all of us were tired out when we arrived.
Most people advise that students’ heavy burden __________.
The _______ scene in the earthquake-stricken area made some people _______ .