So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
| A．many of which | B．many of whom | C．many of that | D．many of them |
Now we have arrived at the lake. But the view I photographed that day ________ any more.
| A．doesn't exist | B．isn't existing |
| C．hasn't existed | D．hadn't existed |
Up to now, our society ________ with limited living space and a shortage of natural resources.
| A．has been challenged | B．is being challenged |
| C．is challenging | D．has challenged |
—Will you see me off at the airport at ten tomorrow morning?
—Sorry, I ________ a lecture then.
| A．will be giving | B．will give |
| C．give | D．have given |
—The rain ________ fast and heavy.
—You should ________ some shelter. Look at you—you are all wet.
| A．is coming; find | B．comes; have found |
| C．came; find | D．came; have found |
I had wanted to help you last night but I couldn't spare any time, for I ________ a composition which I have to hand in this morning.
| A．wrote | B．was writing |
| C．had written | D．have written |