Some students were late for class because they had been _________ by the heavy storm.
A．kept B．stopped C．slowed D．delayed
________ you don’t lose heart, I’m sure you can pass the coming examination.
A．Unless B．If not C．As long as D．Although
—How much of the foreign expert’s speech have you understood?
—Almost nothing. I wish I ________ harder at English.
A．worked B．had worked C．would work D．were working
At the crossroads, you have to drive very ________ to avoid traffic accidents.
A．quickly B．cautiously C．curiously D．perfectly
David has to admit the fact ________ he has fallen behind the others in his class.
A．whether B．that C．why D．when
—Where are you going during the summer vacation?
—I’ve found a nice beach ________ I can enjoy swimming.
A．that B．when C．where D．which
