1. Since the regional seed bank was established in 2009, the number of locally adapted crop varieties available to smallholder farmers ---- steadily.

2. While the volunteers ---- water samples from the lower stretch of the river, a sudden rise in the water level forced them to abandon the site.

3. By the time the orbiting telescope becomes fully operational at the end of this decade, the engineering team ---- more than fifteen years to the design and calibration of its primary mirror.

4. The ethics board will not authorise the second phase of the clinical trial until the independent review panel ---- its evaluation of the preliminary safety data.

5. Under the regulations that come into force next January, no construction permit ---- until an independent environmental impact assessment has been submitted to the ministry.

6. The moment the last of the archived field recordings ----, the linguists will begin comparing the dialects spoken on either side of the mountain range.

7. By the time the ministry announced its new emission targets last spring, a number of large manufacturers ---- their own carbon-reduction programmes without waiting for any legal obligation.

8. By the time the additional funding was finally approved, the laboratory ---- for more than two years on a grant that had originally been intended to cover only six months.

9. ---- had the newly built bridge been opened to traffic ---- inspectors detected worrying cracks in one of its main support columns.

10. No sooner ---- their preliminary assessment of the fault line than the provincial authorities ordered the evacuation of three nearby villages.