I like these English songs and they ________many times on the radio.
| A．taught | B．have taught | C．are taught | D．have been taught |
________ is known to us, May 12, 2008 was the day _______ Wenchuan earthquake happened.
| A．Which; on which | B．It; when |
| C．As; which | D．As; when |
They _________ have arrived at lunchtime but their flight was delayed.
| A．will | B．can |
| C．must | D．should |
China is one of the countries ________ the Mekong River flows.
| A．in which | B．by which |
| C．across which | D．through which |
He was _________by his colleagues though he himself didn’t think he had done anything special.
| A．thought little of | B．thought poorly |
| C．thought highly of | D．thought highly |
It was reported that a chemical factory________ last night, which killed thirty workers.
| A．exploded | B．cracked |
| C．ruined | D．burst |