He observed a stranger _______ around the store at 12 p.m. last night.
| A．to hang | B．hang | C．hanging | D．to be hanging |
There are frequently reports of accidents as fireworks ______, stored or transported.
| A．have been made | B．are being made |
| C．were made | D．have made |
Plastic bottles can be recycled but they need cleaning thoroughly, _______ they?
| A．needn't | B． don't | C．mustn't | D．can't |
Of all the methods they provided, ______ is of any help for solving the math problem.
| A．nothing | B．neither | C．none | D．no one |
—Tom seems to be familiar with London.
---Yes. He ___________ here for three years. It’s great for him to be back.
| A．have lived | B．had lived | C．lived | D．lives |
A modern city has been built _____ a very small village was many years ago.
| A．what | B．where | C．that | D．in which |