It is reported that in our country cities ________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.
| A．suffering | B．suffer | C．suffered | D．are suffering |
As I ___ TV, my father ___sleep.
| A．watched; fell | B．watched; was falling | C．was watching; fell | D．was watching; was falling |
When I attended a meeting in Beijing I ___ my old teacher’s house.
| A．called on | B．called at | C．visited at | D．visited on |
David will probably ___, but Martha must leave early.
| A．stay late | B．be late to stay | C．being late | D．staying late |
Mr Anderson left for Colombia two months ago.That’s a pity. I wish___.
| A．I’d meet him | B．I’ll have met him | C．I’d have met him | D．I’ll meet him |
Bill and Betty travelled a long distance __their vacation.
| A．on | B．in | C．at | D．about |