--What do you think of cloning?
--No doubt it’s a great invention. But ________, it may have some side effects.
| A．if not properly handling | B．if properly not handled |
| C．if not properly handled | D．if properly not handling |
Some hard working students always keep a torch in their dormitories _____ there is a power failure．
| A．if | B．unless |
| C．so that | D．in case |
_____ in charge of two classes made Mrs．Li, head of Senior Grade 3, extremely tired．
| A．Leaving |
| B．Left |
| C．Being left |
| D．Having left |
Almost every teenager will experience a period in their life _____ they aren’t content with their parents．
| A．when | B．where | C．that | D．which |
Little did the teacher imagine that a student good at maths _____ have failed in the exam．
| A．might | B．should | C．need | D．would |
— I’ve never seen you so rude!
— I _____ something I shouldn’t have, but I didn’t mean that．
| A．have said | B．had said |
| C．did say | D．was saying |