Look at the dark clouds in the sky. It looks_______ it is going to rain soon.
| A．as though |
| B．although |
| C．even though |
| D．even if |
The boys by the coach now will take part in the sports meeting of the school next month．
| A．chosen | B．being chosen |
| C．choosing | D．to be chosen |
Schools in the cities are well equipped those in the countryside are poor．
| A．if | B．while | C．so | D．as |
I received a letter，poor spelling made me think it was written by a child．
| A．which | B．that | C．whose | D．who |
The new online library makespossible for students to choose books by smart phone off campus．
| A．it | B．one | C．that | D．this |
We were delayed at the airport．Otherwise，wehere by lunch．
| A．must have been | B．could be |
| C．should be | D．would have been |