In this section, we will briefly describe possible ways of reducing the costs and risks __________ in doing this.
A.involving |
B.involved |
C.to involve |
D.being involved |
The last half of the nineteenth century _____ the steady improvement in the meansof travel.
A.has witnessed | B.was witnessed | C.witnessed | D.is witnessed |
Once environment damage _____, it takes many years for the system to recover.
A.has done | B.is to do | C.does | D.is done |
As _____ announced in today's papers, the Shanghai Export Commoditiser Fair is also openon Sunday.
A.being | B.is | C.to be | D.been |
–It must have been lots of fun riding round in a car.
–Yes, you know this was the first time that _____ round in my own car.
A.I rode | B.I should have ridden |
C.I’ve been riding | D.I’d ridden |
Until then, his family _____ from him for six months.
A.didn't hear | B.hasn't been hearing |
C.hasn't heard | D.hadn't heard |