Reportedly on April 15, 2013 three people including a Chinese girl were killed in the Boston Marathon attacks when two bombs were _______, which shocked the whole world.
| A．set about | B．set off | C．set up | D．set out |
________ get a complete picture, more information is needed.
| A．So as to | B．So as not to | C．In order not to | D．In order to |
The USA is a large country in ________ many different dialects are spoken.
| A．that | B．which | C．where | D．it |
Look at this! It’s broken now! You ________ have been careful!
| A．could | B．must | C．would | D．should |
It was my sister ________ first had the idea to cycle along the entire Mekong River.
| A．who | B．whom | C．/ | D．which |
I’m surprised to hear from my school teacher again. ________, it is ten years since we met last.
| A．In a word | B．Believe it or not | C．That’s to say | D．Of course |