Earth Day is celebration of life and our planet. It is a reminder that we need to ________the world we live in and that we should learn to respect life and nature.
| A．care about |
| B．think of |
| C．refer to |
| D．watch out |
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 |
The exhibition is well worth ________ and you can see fancy vases of different dynasties on show there.
| A．to visit | B．to be visited |
| C．being visited | D．visiting |