They use specially trained dogs to _____ their sheep at night.
| A．take care | B．get along with | C．watch over | D．turn to |
The school _______ he once studied in is famous.
| A．where | B．in which | C．in that | D．that |
The doctor said there was ______ with her, but she could not help worrying.
| A．serious something | B．nothing serious | C．something serious | D．serious nothing |
___________ she was chosen made us very happy.
| A．What | B．That | C．Why | D．How |
Ten years ________a long time in one’s life.
| A．has been | B．are | C．is | D．have been |
— It’s the office! So you know eating is not allowed here.
— Oh, sorry.
| A．must | B．will | C．may | D．need |