David threatened_____ his neighbour to the police if the damages were not paid. 
| A．to be reported | B．reporting |
| C．to report | D．having reported |
Last Sunday I went to visit the History Museum where I saw a pot _________ about 1,000 years before.
| A．so it had been | B．so had it been | C．what it had been | D．as it had been |
The reason why this kind of machine is popular with users is that it will work in ______ temperature.
| A．official | B．extreme | C．common | D．natural |
--- Haven’t seen you for ages! Where have you been, anywhere ?
--- I _______ to New York City. I just got back.
| A．have been sent | B．was sent | C．had been sending | D．would be sent |
________ the punishment was unjust , he would accept it without saying anything, because he knew it was the rule of the company.
| A．As though | B．Even though | C．In case | D．Now that |
His teacher told him that since his parents were working abroad, either his grandparents or one of his uncles ______ allowed to come to the parents’ meeting .
| A．was | B．were | C．are | D．is |