Dogs are our good friends as they can keep ______ with us when we are lonely.
Being injured in the leg made _______ impossible for him to walk his way home.
It is believed that a new kind of drug _____ by the scientists and they are hopeful that they will succeed in a few months.
— He was given a free five-day trip to Hainan. — He _____ it since he has worked so hard.
—When was Tom bitten by a snake? —It was on a Sunday _______ he was taking a trip to the mountainous area.
Jane said, “What did he hear about a week ago?” Jane asked ____ about _____.