The largest collection ever found in England was one of about 200,000 silver coins, _____ over 600 years old．
| A．all of which | B．all of it | C．all of that | D．all of them |
He told us an interesting story about himself, _______________why he didn’t succeed that time.
| A．explain | B．to explain | C．explained | D．explaining |
Don’tplaywiththedog,Jack,forit_____________bedangerousattimes.
| A．shall | B．should | C．can | D．Must |
I_____in London for many years, but I’ve never regretted my final decision to move back to China.
| A．lived | B．was living | C．have lived | D．had lived |
Nowadaystherolesofhusbandandwifearenotas__________definedasbefore,especiallywhenbothpartnersworkandearnmoneyforthefamily.
| A．clear | B．clearer | C．clearly | D．moreclearly |
It’s said that a car accident_____________on the highway this morning.
| A．happens | B．happened | C．was happened | D．has been happened |