If the weather had been better, we could have had a picnic. But it ____ all day.
| A．rained | B．rains | C．has rained | D．is raining |
She has set a new record, that is, the sales of her latest book ___50 million.
| A．have reached | B．has reached | C．are reaching | D．had reached |
The first use of atomic weapons was in 1945, and their power ____increased enormously ever since.
| A．is | B．was | C．has been | D．had been. |
–Have you heard the latest news?
-No, what ____?
| A．is it | B．is there | C．are they | D．are those |
The father as well as his three children ___skating on the frozen river every Sunday afternoon in winter.
| A．is going | B．go | C．goes | D．are going |
Not Tom, but I ___to blame for the failure.
| A．am | B．are | C．is | D．be |