Only when I left my parents for America ____ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
Adam left word with my wife ______ he would call again in the afternoon.
| A．who | B．as | C．that | D．which |
. -- Do you think Allan came by taxi?
-- No. If he had, I don't believe he ______ his bike here.
| A．would leave | B．left | C．would have left | D．had left |
The road becomes so crowded during rush hours, ______ it becomes a very slow route.
| A．which | B．when | C．where | D．that |
-- The classroom looks like a mess!
-- Yes, but who left the waste paper ______ around?
| A．lie | B．to lie | C．lay | D．lying |
-- I think we'll give Bob a ring.
-- We ______ . We have been out of touch with him for ages.
| A．will | B．may | C．have to | D．ought to |