When first __________to the market ,these products enjoyed great success .
Strong sandstorms are often _____ you cannot see the sun.
He then moved to London, _____ he became famous.
One third of the class _____ agreed to be volunteers to help the aged this vocation.
It’s been years since I _____ myself so much.
— We’ll go to climb the moutain this weekend. Would you like to join us?— _____