Being a parent is not always easy, and being the parent of a child with special needs often carries with___ extra stress.
| A．it | B．them | C．one | D．him |
Air, _ __we breathe every day, is around us all the time.
| A．that | B．/ | C．which | D．it |
The radio set __ _ last week has been out of order.
| A．I bought | B．I bought it | C．which I bought it | D．what I bought |
He is a man of great knowledge, ___much can be learned.
| A．in whom | B．about whom | C．from whom | D．of whom |
Now we can fly to Tokyo. There was a time ________ we had to take a boat.
| A．how | B．what | C．why | D．when |
The world ______ is made up of matter.
| A．in that we live | B．on which we live | C．where we live in | D．we live in |