Flying kites, ______ some researchers point out, can not only bring about joy to us, but also promote our physical and mental health.
| A．which | B．what | C．as | D．where |
A small car is big enough for a family of three ___you need more space for baggage.
| A．once | B．because |
| C．if | D．unless |
His parents thought he was working very hard in the room, _____in fact, he was chatting with his friends on the Internet.
| A．when | B．where |
| C．which | D．while |
.The girl began to _____the piano when she was young.
| A．practise to play | B．practise playing |
| C．practise to be played | D．practise play |
.The house rent is expensive. I've got about half the space I had at home and I'm paying ______here.
| A．as three times much | B．as much three times |
| C．much as three times | D．three times as much |
.It is reported that two exhibition centres, ____are being built in my city, will
open next year.
| A．they both | B．both of which |
| C．which both | D．both of them |