Teachers recommend parents __________ their children under 12 to ride bicycles to school for safety.
| A．not allow |
| B．do not allow |
| C．mustn't allow |
| D．couldn't allow |
His father ________ for a week.
| A．died | B．will die | C．has been died | D．has been dead |
My mother is ill. I _______stay at home and look after her.
| A．has to | B．must | C．would | D．have to |
---Do you know the Frenchman?
---Yes. I ______him for two years.
| A．know | B．have known | C．knew | D．have been known |
They______ all their money, so they have to walk home.
| A．spend | B．had spent | C．have spent | D．will spend |
Great changes_______ in the city, and a lot of factories_______.
| A．have been taken place, have been set up | B．have taken place, have been set up |
| C．have taken place, have set up | D．were taken place, were set up |