---How long _______ each other before they ________ married ?
-- -For about a year .
| A．have they known ; get | B．did they know ; were going to get |
| C．do they know ; are going to get | D．had they known ; got |
How pleasant the picture is to _________!
| A．be looked at | B．being looked at | C．looking at | D．look at |
Jack went to college last year, _________ to return home until he achieves his goal.
| A．determining not | B．not determined | C．not determining | D．determined not |
— What’s that terrible noise?
— The boys _________ for a party.
| A．are preparing | B．have prepared | C．prepare | D．will prepare |
Every minute is made full use of _________ our lessons before the exam.
| A．studying | B．studied | C．to study | D．being studied |
Help is needed for families _________ homes were destroyed during the earthquake.
| A．which | B．when | C．whose | D．where |