I met a friend of mine on my way here.
| A．to | B．/ | C．at | D．in |
English is useful subject.
| A．a | B．an | C．the | D．/ |
My aunt has been a teacher three years ago.
| A．for | B．after | C．from | D．since |
The good news made us very happy.
| A．feel | B．to feel | C．felt | D．feeling |
You need your classroom every day.
| A．to clean | B．clean | C．cleaning | D．to cleaning |