Taught in a more professional way, you the swimming skill much better．
| A．might master | B．would have mastered |
| C．can have mastered | D．could master |
At home, he keeps some pets，to which he ______ all his spare time.
| A．spends | B．offers | C．devotes | D．provides |
As is recorded in history, silkworms were first raised in ____we now know as Hebei Province.
| A．where | B．that | C．which | D．what |
He got completely when he saw both Lucy and Lily, who are twin sisters.
| A．confusing | B．confused | C．confuse | D．confuses |
______ the new policy, we are now living in a grand, new apartment.
| A．In that | B．Due to | C．Thanks to | D．In hope of |
John’s never willing to change his mind. It is no use ______with him.
| A．to argue | B．arguing | C．argued | D．having argued |