Look at the terrible situation I am in! If only I your advice.
| A．follow | B．had followed |
| C．would follow | D．have followed |
The house is dirty because it ________ since they moved out.
| A．doesn't clean | B．isn't cleaned |
| C．hasn't cleaned | D．hasn't been cleaned |
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 |