In the past few years the workers have got no wage increases ____ their doubled production.

In the past few years, traffic problems （become) ________ more and more serious.

Now scientists have found in the past few years ______.A．the exposure of DNA to the public

In the past few years, it has been a trend for Chinese universities to build new campuses,

If only I______hard in the past few months! But I didnt work hard enough and failed the ma

In the past few years the workers have______ a lot of suggestions, some of which are being

AIDS is said() have been the biggest health challenge to both men and women in that area over the past few years.