Guess what! I came across my primary school science teacher this morning, ______ I have lost touch for almost 20 years.
_____ is known to everybody is ____ the moon travels round the earth once a month.
Tom ____ desperate in front of the locked door.
The science of medicine, _____ progress has been very rapid lately, is perhaps the most important of all the science.
This is the largest clock in the world, _____ the minute hand is six meters long.
Sarah hopes to become a friend of _____ shares her interests.