I was at the party yesterday
there was the bad weather last month
there was an accident on the road
my doughter was doing her homework when i saw her
she was my best friend but for now she isn't
we were surprised when an owl brought a letter for us
1. a) -, b) a
2. a) an, b) -
3. <span>a) -, b) a
4. </span><span>a) a, b) a
5. </span><span>a) a, b) an
6. </span><span>a) -, b) a
7. </span><span>a) a, b) some
8. </span><span>a) a, b) some</span>
1. Do several examples denonstrate this idea?
2 Will you study amplifier circuits at the next lecture?
3. Did the device calculate the frequency of electromagnetic waves ?
4. Does the frequency of free oscillations of an open tuned circuit depend upon its capacitance and inductance?
5. Did operators make all the connections by hand place in the early days of telephone?
6. Will/won't the waves cancel each other and will considerable radiation take ?
7. Did the detector completely cut off one-half of the wave?
8. Do energy losses take place in any aerial?
9. Are glass fibers cheaper and lighter than copper wires?
10. Did the automatic station "Zond-7" maintain stable?