---Guys, I was really worn out! I cant walk any further!
--- We should have a rest. We ______ the cave a whole day.
| A．exploring | B．are exploring |
| C． have been exploring | D．explore |
Evidence has been piled updrinking water before breakfast is good for our health.
| A．what | B．which | C．if | D．that |
Now it’s been possible for us to be taken into “space”, we can experience weightlessness for a short time.
| A．which | B．when | C．where | D．that |
Consumers are getting more sensible and buy onlythey need in spite of all the advertisements they see.
| A．that | B．what | C．which | D．whether |
a little money from her pocket money, Alice was able to buy her mother a lovely scarf.
| A．To save | B．Saving | C．Saved | D．Having saved |
—Hi. Mary. Do you still remember the first time we met?
—Sure. Youdinner with your friends in a restaurant.
| A．have | B．had | C．were having | D．have had |