The discovery was made in the 1950s, while the ________ of it was not recognized until half a century later.
To learn English well, we should find opportunities to hear English ________ as much as we can.
A cook will be immediately fired if he was found ________ in kitchen.
If you are in trouble,Mike is always willing to________a hand.
My uncle hasn't been able to quit smoking,but at least he has ________.
Team leaders must ensure that all members ________ their natural desire to avoid the embarrassment associated with making mistakes.