______ is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
| A．It | B．Which | C．As | D．What |
The producer comes regularly to collect the cameras _______ to our shop for quality problems.
| A．returning | B．returned | C．to return | D．to be returned |
You’d better write down her phone number before you _______ it.
| A．forget | B．are forgetting | C．forgot | D．will forget |
I’ve ordered some pizza, so we _______ worry about cooking when we get home tired.
| A．can’t | B．dare not | C．needn’t | D．may not |
--- Why not stay here a little longer?
---, but I really have to go.
| A． | Never mind | B． | I'd love to |
| C． | Pleased to meet you | D． | I can't find any reason |
A smile costs _______, but gives much.
| A．anything | B．something | C．nothing | D．everything |