Eating too much fat can ______ heart disease and cause high blood pressure.
| A．result from | B．contribute to | C．come across | D．focus on |
--- I ______ so busily recently that I ______ no time to help you with your math.
--- That’s OK. I can manage it by myself.
| A．have been working; have |
| B．have worked; had |
| C．am working; will have |
| D．had been working; had had |
--- Oh, dear. I forgot the air tickets.
--- You ______ something.
| A．have left | B．are always leaving |
| C．are leaving | D．always left |
Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests.
| A．before | B．since | C．when | D．after |
By the time you arrive home, I ____, so please don’t make any noise when you come in.
| A．shall have been sleeping | B．shall have slept |
| C．shall sleep | D．shall be sleeping |
It’s a bad practice to ____ children much money as a New Year gift.
| A．promise | B．permit | C．admit | D．allow |