Attention! _________ in the form right now, making sure that every detail supplied is accurate.
| A．Filling | B．Fill | C．To fill | D．Being filled |
---- There is a lot of smoke coming out of the teaching-building there.
---- Really? It _____ be a fire, most probably.
| A．can | B．ought to | C．have to | D．must |
If you don’t wait _______ the red light, you will be punished by the policeman.
| A．at | B．under | C．for | D．on |
________ doesn’t seem to have been much difficulty in solving the problem.
| A．It | B．That | C．There | D．He |
It is fairly common in Africa for there______ a group of expert musicians surrounded by others who also join in the performances.
| A．being | B．to be |
| C．be | D．is |
I_____ violin lessons every two weeks, but I think I ‘ll make it every week from next month.
| A．am having | B．have had |
| C．have | D．have been having |