The river______ surface used to be covered with waste and rubbish is now taking on a new look.
| A．of which | B．along with | C．where | D．whose |
________ was most important to her was her family.
| A．What | B．Which | C．As | D．It |
All of us found ______ difficult to work out the maths problem.
| A．what | B．that | C．which | D．it |
By the time these books were published, he _____ addicted to them.
| A．had become | B．becomes | C．has become | D．became |
I’m fine — I just felt a bit sleepy and tired, that was ________ I went to bed so early."
| A．because | B．when | C．that | D．why |
—why, Jack, you look so tired!
—Well, I _____the house and I must finish the work tomor
row.
| A．was painting | B．will be painting | C．have painted | D．have been painting |