【推荐1】Don’t call me at the office ______ it is necessary.

A．before

B．unless

C．although

D．till

【推荐2】---As is reported, retirement age should be put off immediately.
--- Easier said than done.We take___________all factors into consideration, we shall be faced with some other social problems.

A．unless

B．until

C．if

D．once

【推荐3】China’s   Silk   Road   Economic   Belt, ____ accomplished, will   quicken   the   economic   growth   of   the countries along the route.

A．as	B．once
C．though	D．unless

【推荐1】Only in this way, ________ good grades in this examination.

A．can we get

B．we can get

C．we are getting

D．we will get

【推荐2】Hardly______ the station when the train started.

A．I had arrived at	B．had I arrived
C．had I reached	D．I had got to

【推荐3】________ did he and his bother learn English well_______ they spoke fluent French.

A．Not only, but also

B．Either, or

C．Both, and

D．Neither, nor