250. Jack is a very stubborn(顽固的) person. I was unable to _____ him to do as I said. I want to ask you to have a word with him.
| A．let | B．make | C．prevent | D．Persuade |
This is the same bicycle ___ I lost.
| A．as | B．that | C．which | D．A and B |
There are no children ___ love their parents.
| A．that do not | B．who does not | C．that | D．who |
Children should not have more money ___ needed.
| A．which | B．that | C．than | D．as |
---Mary hasn't written to us for a long time.---What do you suppose __ to her?
| A．happened | B．to happen | C．was happened | D．having happened |
| A．are; were | B．is; were | C．are; was | D．is; was |