We hope to go to the beach tomorrow, but we won’t go ____ it’s raining.
| A．if | B．when | C．though | D．because |
Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.
| A．showed | B．has shown | C．will show | D．is showing |
.It is said that the early European playing-cards ______for entertainment and education.
| A．were being designed | B．have designed | C．have been designed | D．were designed |
31.The company had about 20 notebook computers but only one third _______used regularly . Now we have 60 working all day long.
| A．is | B．are | C．was | D．were |
The young girl sitting next to me on the plane was very nervous.She ______before.
| A．hasn’t flown | B．didn’t fly | C．hadn’t flown | D．wasn’t flying |
. –Is there anything wrong , Bob ? You look sad .
--Oh, nothing much. In fact ,I _____of my friends back home .
| A．have just thought | B．was just thinking | C．would just think | D．will just be thingking |