For the engine to work, the green button be in the “on” position.
The conflict had developed into a stage ______ the two countries were gathering big troops on the border.
The schools themselves admit that not all children will be successful in the jobs ______ they are being trained.
______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction.
.When doing your history homework on the Civil War by typing in details to Google, a list of related books will ______ .
He _______ to go to Tsinghua University to study after graduating from high school, so he is working very hard.