At present ,our school is calling on us to learn from _____LeiFeng and to be ____living LeiFeng.
| A．a , a | B．/;a | C．/ ; / | D．the ; / |
The first use of atomic weapons was in 1945, and their power __________ increased enormously eversince.
| A．is |
| B．was |
| C．has been |
| D．had been |
I__________ letters this morning and I__________ for four hours so far.
| A．will write; wrote |
| B．have written; have written |
| C．was writing; wrote |
| D．have been writing; have written |
They __________ on the program for almost one week before I joined them, and now we __________ it as no good results have come out so far.
| A．had been working; are still working |
| B．had worked; were still working |
| C．have been working; have worked |
| D．have worked; are still working |
—Hi, Tracy, you look tired.
—I am tired. I__________ the living room all day.
| A．painted |
| B．had painted |
| C．have been painting |
| D．have painted |
I think we can safely __________ that interest rates will go up again soon.
| A．assume |
| B．accomplish |
| C．attain |
| D．assemble |