( ) 28. Things fall to the ground _______ go up into the air because of gravity.
| A．instead of | B．than | C．rather than | D．in place of |
Time should be made good use of ____ our lessons well.
| A．to learn | B．learning | C．learn | D．learnt |
— ____ you read the newspaper?
— Yes. I ____ it on the bus while I was on my way to work.
| A．Have; read | B．Did; read | C．Have; have read | D．Did; have read |
We ____ on this project for four hours. Let’s have a rest.
| A．are working | B．have been working | C．worked | D．had worked |
Internet shopping is really ____ when people are sure of its safety.
| A．taking off | B．taking up | C．setting up | D．setting off |
Tired, Jim was fast asleep with his back ____ a big tree.
| A．in | B．below | C．beside | D．against |