________ your son is well again, you no longer have anything to worry about.
| A．If | B．when | C．Now that | D．As soon as |
.He suddenly saw what looked like a snake in the darkness. For an instant his heart seemed to stop ______.
| A．to beat | B．beating | C．beaten | D．being beaten |
I can think of many cases ______ students obviously knew a lot of English words and expressions but couldn't write a good essay.
| A．why | B．which | C．as | D．where |
---I'm sorry I stepped outside for a smoke. I was very tired.
---There is no ______ for this while you are on duty.
| A．reason | B．excuse | C．cause | D．explanation |
.It ______ to me that I should pay a visit to my friend Jane next week.
| A．happened | B．supposed | C．proved | D．occurred |
Public attention at the moment is ______ on the problem of how to create
opportunities for the laid-off workers.
| A．focused | B．paid | C．attracted | D．concerned |