In face of ______failure, it is the most important to keep up ______ a good state of mind. A a; - B.the; - C.-; a D.-; the
________passenger plane crashed near Gazvin, Iran and all 168 people on________board were killed.
--How often do you drop your English teacher a line? ---________. But usually once a week.
Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.
Exactly ____they did when at last they reached the sea remains a complete mystery.
One thing’s for sure, the fire _____by some cigarette butts.