____ you promise to buy her a gift, you can’t break it in any case.
| A．Once | B．Until | C． For | D．That |
It’s so nice to hear from her again.____________, we last met more than thirty years ago.
| A．What’s more | B．That’s to say | C．In other words | D．Believe it or not |
The parents seemed satisfied with the news __________ their son had been employed by a large company.
| A．what | B．which | C．that | D．when |
We have overlooked the fact __________ the children’s emotional development may be easily damaged.
| A．which | B．that | C．what | D．不填 |
In Mark’s speech, he made the point __________ far more people died from smoking than from taking drugs.
| A．where | B．what | C．which | D．that |
It is already well understood___________ causes the global warming.
| A．what | B．when | C．how | D．that |