49. I don’t know whether small oranges are sweeter than big ______.
| A．those | B．ones | C．one | D．that |
The computer center, ________ last year, is very popular among the students in this school.
| A．open | B．opening | C．have opened | D．opened |
We can’t take part in the competition ________ we get our student card.
| A．before | B．if | C．While | D．as |
He made a promise __________he would help me.
| A．what | B．when | C．that | D．which |
It was in New Zealand ___ Elizabeth first met Mr. Smith.
| A．that | B．how | C．which | D．when |
There is a ______ table in the middle of the room.
| A．round brown old wooden | B．round old brown wooden |
| C．old round wooden brown | D．old brown round wooden |